Being the crossover starts right behind the exhaust valve, then anything off idle will be throwing Fireballs back and forth from 4 cylinders directly under the carb.
Could it be restricted?
Could a 3/8th tube be installed from one exhaust port on each head when filling the head passage to supply restricted heat?
Are any here pouring the head passage then plumbing coolant through the intake?
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Bull Nose Formula-461, 6x-4, Q-jet, HEI, TH400, 8.5 3.08, superslowjunk
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