What year is the carb and does it have APT adjustment? If it is a later carb then you can easily see if adjusting the APT to richen the cruise mix helps. FWIW both of my cars have Cliff-built carbs and both have wideband meters, and the cruise A/F was spot on as he set them up. So it shouldn't be a lean surge but then again anything is possible.
Its been a long time since I had one of those adjustable crane vacuum cans, but I seem to remember that adjusting it changes the base timing as well as the advance? If so then you would need to disconnect it and re-set the base timing after you make an adjustment. The idea is to keep the timing curve without vacuum in the sweet spot for max power, and then add in as much vacuum advance as it will take without pinging or surging.
Yes running cooler definitely helps maintain oil pressure. 205 deg won't hurt the engine but most of us aim for 180-190 as optimum.
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1969 Lemans vert, matador red, 462 CI, 3.07 12-bolt posi
1974 455 TA, admiralty blue/red interior HPP "cover car" - sold
"The best way to show a car is to drive it"
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