Quote:
Originally Posted by b-man
Clearly there's a 1964 intake and heads on your engine (heater hose on front water crossover), more than likely a complete 1964 389 from a big Pontiac.
A 1964 GTO 389 will have casting 9770716 on the center exhaust ports, big Pontiac 389 will have 9773345 heads.
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You had me very nervous. The casting is indeed 9770716. I just went to take a look.