Depends on what type of engine you have in the 88 and the 90. Ironically enough, if the 90 is a dual-carb (b20a3 pk1) and not fuel injected (pk2 or pk3 -- for the 2.0 and 2.1 fi engines), then you're screwed. Seriously...it's the hardest to find and least versatile for interchangeability. find out the engine type (not just b20a3, but the pk number also) on both and check with your honda dealer. then ur set!
good luck!
