Thanks Trifive. I just pulled my valve cover to replace the gasket and noted my heads. Your listing gave me the confirmation I needed. Looks like I have a 74-76 350 from a Camaro/Z28. That is consistent with the fact that I have a 10 bolt posi rear end, that I was told came from a Camaro. I'll bet they had a donor car when they built my '57. Great info. Thanks again. John
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