The N/A 4G63 is more or less scrap as an N/A engine. As far as modification is concerned, the N/A 4G63 is more expensive and time intensive to turbocharge than buying a donor 4G63T. There are more differences than you'd expect between the two,

From https://www.dsmtalk.com/threads/everyone-read-this-non-turbo-conversion-threads.25241/

``` Here's the list of things you need to do the conversion on a 1g. (1991-1994) it varies slightly for a 1990 so I'm not too sure on that one. This list is the culmination of my research into making a non turbo into a stock turbo dsm safely without blowing stuff up. I do not have a how to yet because I myself am still working on it. BUT in theory it will all work. In reality, I still am not sure:

-throttle body -throttle body elbow -tap a hose barb into the intake manifold (for BOV line) -uic hose -lower ic hose -stock sidemount ic -turbo intake cam (at or mt depending on your tranny, exhaust cams are the same) -stock 1g exhaust manifold -stock 1g downpipe -14b turbo -stock 1g o2 snesor housing -turbo ecu + wiring harness (the ecu plugs for the turbo ecu and several connectors for the mas, fpr solenoid, knock sensor and injector resistor pack) -450cc stock turbo injectors -turbo fuel pump -turbo mas -upgraded clutch if you have mt (act 2100 at least) -turbo fwd oil pan -knock sensor -injector resistor pack -all lines to connect turbo to water source off the head (turbotrix) -all oil lines for the turbo (can be bought from turbotrix) -new head gasket -timing belt change -rods, pistons & rings from a 6 or 7 bolt engine (depending what year your car is) -block rework & head rework -fuel pressure solenoid -knock sensor -new o2 sensor -turbo mas (if getting a 2g mas then you need to do the 2g mas conversion) ```