Q2 - a ZC dizzy.....as i assume u mean the [acronym:9953e1ff9a="Double Overhead Cam"]DOHC[/acronym:9953e1ff9a] blacktop ZC found in Japan - to the best of my basic knowledge will fit onto a D16a8 engine...and work. Maybe some issues with timing etc ?!?

Q3...best only to think along the lines of " what God gave it at birth" methinks here.....
Only "ZC" style engines would have the capability to be in similar /same timing for our local D16a8. Such as older integras - some Rovers , EG5's in Oz and Japan . But the older CRX D16a8 i believe just dosent work with the newer series engine.
Soem one who knows for sure please....