A 1957 Pontiac weighs about 3700 pounds which is pretty much the same as a ‘68 A-body Pontiac and a few hundred pounds more at most than the same year F-body, both of which came with the OHC-6 as the standard engine.
The weight difference isn’t an issue so swap away.
The body lines of the ‘57 make it look like it’s a heavy car but it really isn’t.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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