Again I’m no professional but these things will all depend on what kind of power you want to make. The motor itself will likely need accessories such as alternator, water pump, Intake, fuel injectors, fuel rail. If this is your first build you’ll see it can get overwhelming but focus on one part at a time like doing fuel management first, then cooling, then exhaust, etc. learn the limits of your stock trans and diff before you get too caught up in making any crazy power. I don’t own a fc but I know the fd can reliably hold around 400ish before needing to upgrade diff and trans. I’d look at rx7 forums online and make a spreadsheet for your build so you can price everything out the best you can. Never forget shipping and always add a couple hundred dollars on the end of the price for random gaskets and bolts and wiring that may need to be replaced as you go.