This assumes that the 72 hasn't been converted to BBP. It will swap. Since the V-8 K-member will be needed, the easiest and fastest way to do the swap is to drop the entire assembled K-frame (engine, transmission, steering gear, suspension) through the bottom of the car. If rear on 72 is an open 7ΒΌ, keep what you have. If the 72 has disk brakes, the master cylinder and all underhood brake hardware will be needed.