I have a 1950 Ford Convertible. It had a "tired OD" and I replaced it with a the T5 conversion, 3.25 9 inch rear end from a 1959 ford. The engine is a 255 that was overhauled by Ol' Ron about 10 years ago - mild cam and a 4 barrel with a modern distributor. It goes down the road very well. 70MPH...