The original engine had a bad main bearing and cracked block. I was gifted a nicer already machined 31 block with bell housing.

I believe that the 31 bell housing and mounts will slip into the chassis without issue but the 29 4 speed transmission will obviously not mount to the 31 bell housing.

I don't know if a 1931 4 speed will solve my issue or if I'd need to continue changing bits and pieces back to the axel :-(

I am still contemplating working with the 29 block.