Are JDM engines the same as USDM as far as everything bolting up and functioning correctly? Can I use a JDM LS engine with a USDM LS tranny/ headers and everything else... will it work? Can I use a JDM GSR head on my LS block or vice versa? I have a 94' LS and I'm shopping for parts. Being that I'm a "NOOB" and I hate that word, I know not a whole hell of alot. Help me out guys.