Skip the ZC... go with the B16A... Youll get more power out of it.
I posted the link about the B16 swap information I think If I was going to do something thats the one Id go for.. Its a little more $$ but if your serious about performance your going to get a lot more out of a B16 then a ZC. Just the B16 swap alone with no mods could put the CRX in the 14's. Then you build it, turbo or whatever, you have a lot more options for the B16. Its a little bit harder swap to do then the bolt in ZC too. But this link Tells you step by step what needs to be done to swap.
http://www.hondastyle.com/forums/sho...&threadid=1449