The 1960 Pontiac Master Parts Catalog lists 2 part numbers for heads (could easily be the same casting numbers). 536794 for "All 3/2 B.C. & T425A" engines and 536794 for all other engines. There are no heads listed in the "Special Engine and Chassis Parts" section.
Same catalog has a good chart of what parts were used in which engines in 1960.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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