Depends what it came out of, if it was a van or truck then you can't use the driver side, but a good upgrade over the 318 mannys is a 73 340 manifold(which is way cheaper than the early 340 ones) and a magnum 5.2 318 passenger side manifold (don't need to use an oil filter adapter with these). Pretty good upgrade 2 1/4 and 2 1/8 over any 273 318 exhaust.
