I have a 1950 Chev. "DeLux SportCoupe" which came from the factory with the 235 cu.in. and "PowerGlide" transmission. Upgraded it with a 1961 235, higher lift cam, fenton headers,and overhauled the "PowerGlide" (had it since 1951 and 67XXX miles ago)kept the orginal intake and carburator. The old girl gets away from the stop signs and down the highway with no problems at all. Took me a long time to get the new water pump from "Patricks"
I kinda "Ball Parked" the horsepower at around 130HP, compared to the orginal 100 HP. (It`s fast enough for me and the wife. (Had her since 1951 also.)