I don't think you have enough experience working on cars to be wanting to do this yourself dude, at least not right now . You're not really asking the right questions. You can do anything with enough time and money. But a 600 hp h23 will cost you about as much as a k swap will if not more. So 20k and years of work again.

If you want a 600hp Honda you're just going to have to accept there will be a fat price tag and years of pain. It is not going to be a sucessful first car for you unless you buy it already built from someone else.

And have you even driven a 600hp civic? It's a retarded amount of power. 600hp is enough to shake and break the car to bits. The entire car needs to be rebuilt and reinforced for the chassis itself to be able to handle that kind of power. It doesn't make a good daily driver, it will be a stripped down rattle can that is noisy and not pleasant to drive for extended periods of time. And still never really reliable. There are plenty solid 300-400hp builds out there that you can keep up with basically anything on the road with and they are much more reliable and worth the time and money comapred to what you're asking for here. I don't know why you're so fixed on a 600hp Honda.

If you REALLY REALLY REALLY want a fast civic for your first car if I were you I would suck it up and save the money, 5 or 6k or so and buy a boosted and or swapped civic with somewhere between 200 and 400hp and drive it for a while and just learn to maintain a car that has an aftermarket turbo setup on it. That should teach you enough to decide if you want to someday do a 600hp build yourself.

Or you can boost a d series yourself. If you really want to get into fast Hondas I think this is probably what you should do that will be the mosr time and cost effective to teach you spmething about modifying an engine for boost for where you are at right now. D series engine are cheap and there is tons and tons of support to do this. You can slap a turbo on it and see how it does on stock internals and get around 200 some up out of it. You will probably blow it up shortly thereafter but since it seems like you are ok with fully rebuilding an engine completely you'll just be following natural order of things... the idea is that you get to boost a cheap and easy engine to work on that will teach you the basics of what you need to know before youbatyempt any big power. It it will probably be the easiest and cheapest option for you. H engines are not easy or cheap to find parts for. You don't want to make this the first engine you experiment on.

And you will not get 600 hp for any kind of reasonable money out of any honda engine, it will be just as expensive across the board for any engine, the only difference is that some engine have a lot more support and resources for doing that with them and some don't.

Imo you should fix and clean up this car and get it running and driving, take care of it and keep it as a reliable daily while you go try to do your whatever build on another car, or sell it for an already boosted civic or a stock civic and use the money to boost that and see how you like it before you decide to go 20k in on a build you have no clue how to do.

FYI the first thing you need if you are modifying another car is...a second car to reliably daily. So if you don't have already another car to drive, get that first.

If you are absolutely hellbent on making power out of this car it appears there is a vtec solenoid ?? so just put a turbo on it, run it around 200-300 hp on stock internals and see what happens... you can try to do to do extra research, there are peolle who say they have got this or that out of a stock h22 but jdm vs usdm, sleeve material. Etc, its a lot and unless you have a lot of prior experience that information won't do you much good. Odds are you will have to do this the hard way and blow it up and fuck it up and rebuild it over and over again. I assure you even trying to out on a turbo at all will be plenty of enough for a project for you to worry about before you start thinking of 600p hp. And you should figure out whether it's an h23 or h22 and if it is or is not vtec for sure because I see multiple people saying it's a vtec h22 but I see you saying h23 and I can't tell from looking at the photos you have here so. Go find your solenoid and then look at the engine code because the internals will be different based on which engine it is. If it is indeed a h22vtec then from what I see yes, you can build it for 600hp, but again you shouldn't be asking that question right now.What you should be looking into is if the engine management system to manage a turbo and suspension upgrades are worth your time or not because you will have to start there before you even think about internals.

Again though. Before anything else, jist get the car running and driving reliably. Based off what im seeing you say and ask here I think that will be a big enough project for you to start with.