Just finished up a sm420 rebuild and install. Converted from the standard 3 sp on the column to now down on the floor. The drive went well and 4 sp trans worked perfect. This trans is one really built unit. Sad that I took the original 3sp out that had been in there for 65 years, now out for the bigger brother.

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