I have used the Jim Carter dual exhaust on a 261 and Fenton headers in a '54 1/2 ton. It fits very nicely with 3-speed transmission. The stock muffler fits fine (on both pipes) and sounds nice (the stock muffler is a baffled straight-through design).

The pipes would have to be bent to work with a stock 4-speed transmission and probably for a stock Hydramatic transmission.

Tim