Pre '68 Dave:
Do you have further info on setting the oil pan troughs to match strokes on that "replacement oil pan" ?
As far as trough height, I do not have the dimensions, Chev had pre-made gauges for that setting. I do not know if they ever gave actual dimensions.
One could compare pans to check height.
As far as what Jerry is speaking to, that is nozzle alignment. That can be checked with a garden hose. Under medium pressure the jet of water should hit in the center of the approximately 3/4" x 3/4" square stamping opposite the nozzles.