Correct way to measure piston depth?

Right again BRJ! :notworth: I had the heads cc'ed today. 59cc's I am going to follow your advise and go with the '84-'90 pistons and machine the block properly go get real close to that 10 to 1.
This weekend I am going to take my '74 318 heads and practice gasket matching and a little porting and polishing.:tongue5:
The machine shop looked over the freshly reconditioned 302 castings I got off Craiglist for $100 and confirmed that (believe it or not...) Autozone's vendor did a good job with the valve job and reconditioning. They did say that if I wanted to get a little more out of them I could use some stainless steel valves.... Do you guys have any suggestions for some good ss valves that would help performance...Nailhead as opposed to tulip design I imangine...Right? Any suggestions on the best place to get them.. 1.78/1.50 Thanks