Interesting thread! My 2cents on the oil. I have rebuilt a few of these in the past, and every time we went above 60psi, we had more oil consumption, and crankcase pressure. My Grandfather ( 55 years as a GM mechanic) said it "No way" needed more than 40 psi in any condition ( warmed up). He was right, put back in a stock melling pump and oil consumption dropped way off and cam stayed plenty oiled.
Older internal combustion engines NEED to run rich to run well, and cool, on todays fuel. Modern A/F ratios for performance do not always apply for optimum economy and performance on old engines.. Just my thought, Love all your engineering, Have fun!! Bruce
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