Run on pump gas?
Does it ping in the summer on pump gas? With those #62 heads the compression would be pretty high (unless it has dished pistons). I've had bad experiences with 62 heads and pump gas on these 400s.
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1974 Lemans Sportecoupe GT (daily driver)
.030 over 354, #47 heads (84cc), Lunati voodoo 700 camshaft (207/213 @ .050), logs, 2.5 duals, X-pipe and Dynomax super turbo mufflers, 3.08 rear
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