Well, back in 1972 I had a 1964 Valiant, 2-door post (sedan) and a 1971 340 engine out of a (1971) Demon, had the manifolds bolted to the engine, had the engine supported with a cherry picker and decided to drop her into the engine bay and in doing so, encountered solid interference on BOTH sides as the engine slid into place.... it was too wide for the compartment. I did manage to get it into place, but once on the mounts, the cast iron manifolds were solid against the inner fender panels on BOTH sides... I had to pull it out and replace the manifolds with some cheap, fender-well Hedman headers. That worked well, but entailed butchering the inner fender panels.
