The 59
distributor has a 14 tooth gear, hex drive. The 54 239 has a 13 tooth gear tang drive.
I've converted mine to the later
distributor for better performance. You have to pull the 13 tooth gear off and put it on in place of the 14 tooth gear. Can be a tough job. You'll need the hex drive, and will need to change the oil pump.
For some reason, I had to shorten the hex drive about 5/16" so the
distributor would sit flush with the top of the block.
I have a 54 car engine, my fan is on the end of the water pump shaft.Perhaps you could get a 54 car water pump and mount the fan to it. Maybe you could move the whole timing case cover to the 239. Dennis