[2blu442]

Hi Mike
Easy swap. Trannie will bolt up fine, use the 455 flex plate and it will have holes for the both the TH350 and TH400 torque converters drilled in it. Engine mounts, the metal perch bolted to the crossmember needs to match the rubber mount. So if you don't change the metal perches then use 350 rubber motor mounts. Minor details would be exhaust might need tweaked as the engine is taller and wider. 350 manifolds will fit but not breath as well as big block manifolds. If your car is single exhaust the crossover pipe that runs under the oil pan will need to be changed. The pipe running from the manifold to the back of the car may need adjusted. The drive belt pullys may line up or you may have to bring over the power steering pump from the 455. Your fan shroud may or may not need tweaked. Depending on the size of your radiator you may need to upgrade it for hot summer days. I have made the swap in a couple cars and found I needed a 4 core to keep from overheating with stop and go traffic in the summer for my part of the country. Even with the smogger heads I think you'll enjoy the difference and you can always do other upgrades as the money comes along. Have Fun!