Looks good-Do you know if the factory 1974 360 hp mainifolds ( a-body) have the 2 1/4 outlet on the drivers side. They should be the same as the 73 340 drivers side manifolds. Or do only the earlier 340 manifolds have that 2 1/4 hole (drivers side)
NO!! The 1974 360 HP manifolds do not have the 2 1/4" outlet. Only the 340s (and only some of them) have the 2 1/4" outlet. Some 340s have a 1 7/8" outlet. Some 360 manifolds and some Dakota manifolds have a 2 1/8" outlet, I "machine" the 2 1/8" outlet out to 2 1/4" (plus) but the '74 360 does not have the large outlet. The large hole 360 manifold only came on certain MAGNUM engines for very few years. There was no MAGNUM engine in '74.