A comon swap is to use a 70's Chevrolet Impala but if I was swapping frames on a 56 I would use a 1965 or 66 Buick then install the disc brake set up. The frames before 65 were mostly center spine units and they can be used but you need to cut the front and back off then weld them to your existing center section.
All 66 Buicks nailheads were 425 and you can find them real cheap sometimes.
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