Re: '51 Build w/4bt Cummins
Even though the weight of the two engines is similar, the torque output is significantly greater. This load is transmitted to the frame, and while the metal in the early frames is thicker than a modern frame, it can be more brittle. Boxing plates is just an insurance policy against problems.
Disc brakes all around is not a bad way to go. It is good that you are thinking ahead to wheel clearances for the disc brake conversion. There should be plenty out there that will bolt up to the 12 Bolt rear end.
-Joe
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