replace everything thats broken
the only significant changes are increased compression from new pistons, forged H rods, adjustable cam gears (2) so that it can be adjusted lol, and hopefully a little bit of porting and other little tasks (bigger openings on oil squirters, stronger springs, balanced engine) add up to a better engine. Im doing a bit of research now in lightened pulleys but over driving is an issue and theres too many version of the FWD SR20s to get confused.
ie. VE oil pump is apparently bigger and better than DE, but while bigger than GTiR it flows less. some VE lightened pulleys require small grinding to fit on DE, but require spacer on GTir and DE (or something, im getting confused with it all). Wish I had all the parts and just see what fits, whats lightest and whats strongest.