I have had a DOHC ZC in my 93 and it was OBD1 and i loved it. There is enough aftermarket parts to make it fun BUT they are not almost identical to the 88-89 d16a1I dont have any issues getting parts for my ZC.
D16A1 from an 88-89 integra are almost identical.
Also, in my case the ZC that I have is the EXACT same as the D16A6. So no issues there.
Another thing to note... ZC DOHC's are MAD CHEAP, so if something messes up you can get another one for ~$500. Why even mess with rebuilding?
for Distributors and altinators you almost have to go to an importer because none of them are the same here. The upper rad hose, although not a big deal but its a different length. Just a few problems I ran into.