The 'Vette engine did have a different intake and exhaust setup, in addition to the mentioned cam differences. The 'Vette engine used a 3 carb intake, using the Carter YH side draft carbs. Those carbs are more or less a side draft variant of the YF. The exhaust is a split manifold, similar to Fentons, although I beleive the 'Vette manifold was cast in 1 peice. The outlet for the front section was also setup to run the front pipe under the front of the engine, rather than going back. So the fron 3 cylinders actually dumped into the right hand exhaust pipe, with the rear cylinders using the left. Fentons are usually setup the opposite way. There are a few very minor differences between the '53 and the '54/'55 'Vette 235s, but they are mostly cosmetic. The only real mechanical change, other than the cam, is the air filter setup. The '53 used small single filters on each carb, the '54/'55 used 2 round filters on a plenum.
