Getting The Right Compression Ratio...

Correct me if I'm wrong, but I'm thinking I need the 340 RPM head, with 65cc #60179, because I have those kb243 (OEM) replacements? I'm trying to achieve the earlier 340 compression ration, instead of my dinky 8.5:1

I had the machine shop put the rotating assy together cause I didn't want to mess it up. I'm just afraid I'm going to screw things up with the selection of heads, and gaskets. The reason I say that is because of the measurements, and clearances.

I would have the machine shop put the valvetrain together, but I want a little part in the engine building. Airfilters and valvecovers ain't enuf :P