I went through this a few years ago with a friend's '70 Camaro, I sold him a 454 that I had built and put in a '79 Z. He was worried to death, because everyone told him he needed big block frame mounts to put it in. When I installed it in my '79, I used the same mounts that were on the SB, everything hooked up and fit fine.....even the headers said to use BB frame mounts, they fit fine with the SB ones. Anyway we just used his stock mounts, and it fit just fine in his car.
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