anyone ever swaped a 460 into a 76

I have a 76 f-250 4x4 that has a 460 in it. not the original motor, it also has a 4 speed tranny, this means it came with a 390 or 400, since the bell housing is stock and it fits the 460 it came with the 400, they didn't put a 4 speed behind a 460 untill 83. my problem is it vibrates, someone put the wrong flywheel on it. so ant ideas on what combos of flywheels, pressure plate, and starter will work

I've been told a 360 flywheel will work on a 460. Yours may have a 400 flywheel?

It has been a while since I worked on a 460 ... I think they have a harmonic balancer on the front of the crank, where the belts go. I know that when the balancer gets old the rubber gives way and the balancer slips, causing a vibration.