Correct way to measure piston depth?

qd,
Stay with the stock 1.78 on the intake and use the 67-69 340 exhaust valves as they will flow more than any other that I tried. Backcut the intake valves and the exhaust valves and do a 75* cut on the intake and exh. sides in of the bowls. Then radius the short turn on the exh. side and remove the sharp edeges from the rest of the bowl and you'll be done.