Marvin,
I believe you could get a sm420 in 1/2 and 3/4 ton trucks from 48-54, all had torque tubes bells connected to them.
The question is would his wheelbase change and would his existing torque tube bolt up the the sm420 bell mount.

Last edited by sstock; 11/26/2019 2:32 PM.
1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration