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The answer to this question is, more appropriately, "How big is your wallet?" The frame on these cars is similar to what came on the 67-69 Camaros and Firebirds. There is plenty of room to fit a big block Chevy, Pontiac 455, Buick 455, Olds 455, and very likely a Cadillac 472/500 with factory parts. The Chevy big block can be made to over 700 cubic inches. This is not the cheapest option ($40k plus). There are many companies that offer frame mount conversions for almost any engine. If you have access to a welder, these frame mounts would not be difficult to fabricate.

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14y ago
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Q: What is the biggest size engine that will fit in a 1977 Chevy Nova?
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