After reading the previous post on DOHC ZC, I figured now would be a good time to ask about a similar transplant...
I've purchased a ZC thinking about popping it into our nice 88 CRX SI, but have reconsidered keeping the SI stock and upgrading an '88 DX. Got a '90 SI engine wiring harness but haven't gotten the ECU from seller and maybe never will.
Are the PM5 & PM6 ECUs able to emulate a PM7?
A decade ago I resolved transplanting an SI engine into an HF using 750 Honda motorcycle carbs.

 

Just use your original harness, and wire it up for mpfi

for the ecu, a pg7 (88-89 integra) 5 speed ecu is cheap and works great

 

Yea the pm5 won't work. I've ran a pm6 on my dohc zc and it actually made it get pretty good gas mileage and pass smog. Now I have a PG7 that's the closest you'll get to a real pm7 which is pretty hard to find.

 

pg7 is good, very similar base maps and like jdpower said, it's as close as you can get to a pm7, which can be bought for 150 through companies like hmotors, but considering u might be able to find a pg7 at a junkyard or on ebay (i paid 70 i think)...there's no real reason to go with anything else....besides...pg7 is the only one i know that'll give you the rev limit range for the zc and best of all...no speed limiter