I bought my 1939 Master Deluxe 235 6volt. I changed starter and generator to 12v. I pulled the motor to fix all of the oil leakes. I found several cracks In the block. So I think I will changed the engine to a Chevy 250. My question is can I change the generator and starter, flywheel, from the 235 to 250. Would it be a direct bolt on? Also were can I find a master overhaul kit for the 250? Also can I change my 1939 Master Deluxe drive train to a newer drive train? I would like to change the drive line and rear end from the stock 6 lug to a 5 lug. I would like to change the factory 3 speed transmission to a 5 speed with overdrive. So I would greatly appreciate all of your help.