well for starters
http://www.honda-tech.com/zerothread?id=719350
http://www.honda-tech.com/zerothread?id=778287
Mounts for b7, z6, y7, and y8 are identical.
If you just get a y8 wiring harness and then an adapter to run a p28 you'll save youreself a lot of work. The harnesses arent that much money anymore.
A z6 wouldve been a lot less work...but I bet youve already heard that from others...
If you want more info, I suggest SEARCHING honda-tech. The info is probably there, but I went through 8pages of old threads before I got sick of it...I know it'd be there though.
What yr y8 manifold is it and is it manual or auto? That makes a difference if you got it separate from the motor/tranny.