UPDATE:
For anyone who cares about the outcome of this issue, I discovered after tearing the engine completely down to rebuild, again, that my oil pump had a chunk missing out of the seat where the pressure regulating steel ball sits down in the cast iron housing. Therefore I do not know how much or when the regulation was happening. Repair would be cost prohibitive, apparently 1 year only 1955 Pontiac/Gmc oil pump body is next to impossible to find. I did finally find ONE for sale and paid almost $300 to get it, but in the end I did find a replacement. Still had to do the complete rebuild because of the issues it caused though.
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