With the crank in place... just changing the pump the plasta-gauge was the best option, I agree that bore gauge is the better option if you have it torn down.

If I remember correctly clearance was ~.002. How is this; I KNOW it was not out on the open end of the tolerance.

The Cam and lifters are GM parts 0.527" / 0.544" lfit, 224 / 234 degrees duration @ 0.050" lift 502/502 cam shaft.