Calling all 318 guys....318 vs 5.2 magnum, info needed please

I run a 5.2 Magnum out of a 94 pickup in my 72 Valiant. Magnum intake and carb, regular small block distributor, flywheel and 3 speed manual out of an Aspen, earlier small block timing cover and water pump and alternator brackets, 50 dollar set of used headers, it was easy. I believe some of the later Magnums have a different vibration damper.