Hi all, I have a 1955 T-Bird with a 57 312. The exhaust manifolds however are set up as stock with the passenger side being from a Fairlane with a 6 3/4” outside diameter and the left side the typical 312 manifold with a 7 3/4” OD. The engine runs great but I’m wondering if It would be worth the effort to replace the right side passenger car manifold with a correct 57 312 manifold. The next time I take the car out I intend to take the temperature of both sides, I’m thinking the right side will be hotter but that’s yet to be determined. Any thoughts?

1955 312 T-Bird Warwick, NY