I know that this question must have been asked 1 billion times but what engines can I swap without too much custom fabrication into my 90 Gs Integra? or direct me to a thread that has already answered this. Thanks.
A straightforward swap without converting harnesses or anything like that is a JDM B16A SiR swap. Its cable clutch like your engine and its OBD0 like your car. Everything else you'll need some kind of conversion.