I had a warmed over 261 in my 1957 3600 for a while. I also had a 3 speed synchro over drive with split gears (becomes 6 speed) and 3:38 differential gears (NAPCO). It was a great combination, I actually seldom used the OD since the diff gears gave me 70 - 75 mph no problem all day. The engine had enough power to handle the gearing. I got my diff gear's from Patrick's, he actually gave me a discount because I bought two sets of gears (front and rear). I was also able to call him a couple of times to verify some install procedures, a very nice man. Unfortunately, I thought I read he passed away. He'll be missed.
don
