The bolt pattern on the housing will be the same, but you might have to keep the 318 torque converter with the 318 engine. Back in the '70s, the 360 used an externally balanced crankshaft. Two of the counterweights were added to the vibration damper and the torque converter. If you see a block of metal welded to the torque converter near the mounting bolts, it's externally balanced. The 318s used to never be externally balanced and didn't have that weight. If that weight isn't used when needed, you'll have an irritating engine vibration.