Has anyone used the Firm Feel 20:1 manual box

I have 235 60 R 14 all the way around. The front tires are a tight fit. I still have the factory drum brakes and Crager SBP rims with QA1 suspension. That being said, the front tires has a negative camber, otherwise the 235 tire would not fit. This is the way the car was set up when I bought it and handling is great other than being tough to turn.