I have a 54 with 235. I installed a 1954 Corvette split castiron manifold which has the heat riser just like original single manifold. Fentons would work also. I ran twin 2 inch pipe together (about four inches apart) back to the approximate location of the original muffler location. Installed a Bassani stainless steel dual inlet/ dual outlet muffler which has twin open mixing chambers to re blend/ equalize both of the 3 cylinders. I ran 2 inch tail pipes from the Bassani and spread them out to both frame rails out to the rear. The sound is very similar to late model Camero deep tone. I have had flowmasters installed on another 235 and this is a better sound in my opinion.