Ed, Jim,
Nice to hear there's another 460 soon to be terrorizing the area!
It seems you are getting plenty of advice on the engine, so I'll avoid that. My question is, how did you determine comp. ratio without removing the heads? I'm sure you know, to get a true measurement, one must cc the chambers, the cylinder bore for top of piston volume, and also figure headgasket thickness and crush, and a few other things. There just are no short cuts here. If it were me, I'd be pulling those heads, and figuring a true comp. ratio. That is critical to everything else you plan with the engine.
If you are interested, I can send you the formula and worksheet we use here at Honda for measuring comp. ratio's on our prototype engines. It's easy, once you have all the data...just plug it in, and let the pooter do the math! Great for dummies like me!
Best of luck with your new project, and welcome aboard Jim!
See you guys Sunday at the meeting???
~Dave