I've also heard from many people that the later motor mounts simply bolt in--drilling the holes shouldn't be a problem. In fact, I've heard from a bunch of people that the whole cross member from the later trucks will bolt right in, giving you motor mounts, coil springs and factory disc brakes. But I REALLY like the ride of the torsion bars, so I'm not going that way on my '62.
Year One carries new motor mounts for the later trucks if you don't have any luck in the junk yards.
-Brad
