I'd suggest an overdrive trans, either the original style OD 3 speed [post 68 is all syncro] or a modern OD 4 speed, then the rear gear change won't be needed, it's quite spendy ... you'll need the flywheel and clutch package to fit the 235, along with the clutch pedal and linkage [and a hole in the floor], and all the shifting bits, which with the OD 3 speed could be the original column shift parts that might be found with a post in the parts wanted here, or another hole in the floor for a floor shift ... might also need to modify the drive shaft, not sure if there was a length difference
Bill