Did you pull the VC and check the umbrella seals? My 58 had a similar history and I did the same thing you have with yours, took a few weeks till a chunk of old umbrella seal worked it's way down into the pan and the oil pump. Seized the oil pump and broke the shaft going down the freeway.
Sounded like it killed at least one bearing by the time I got her pulled off the freeway. So I now keep an eye on those lil guys after putting another motor in the 58...