Valve to piston clearance?

I truly appreciate your interest in making this accurate, MH. The closed intake valve minimum distance relative to the surface of a 675 head was .090". I asked for the same measurement for the 302 heads but did not get an answer. I THINK the valve position is pretty consistent head type to head type for the same sized valves. But, yes that is a variable that I can't answer without a similar measurement from the 302 head.

What I tried to do was get an answer good enough to see the valves were going to clear the piston heads in the OP's proposed setup by quite a bit, or was it going to be close. If it is <.100" at TDC, I would expect it to be much too close at some number of crank degrees after that. Cam timing can make it better or worse, but I think some eyebrows are needed here. Does not surprise me.... my '68 273 2 BBL pistons that set right at zero-deck had shallow eyebrows, and that was for the stock cam with significantly lower lift and duration.

Best I can do on paper with my parts on hand, and a few other anecdotal references. If I had the actual detailed cam profile, then this would be a snap to accurately compute the clearances at all crank angles in a spreadsheet.