War story, back in the early 2000s, I had a group of Rat Chevy customers and they were eating non-oiled pin rollers at 2-3000 street miles. I called Comp and they said every 75 passes they should be rebuilt (75 x 1/4 mile)
Now, a BBC offset loads the lifter, a BBC is not an FE, but I would not be surprised if a non-oiled pin failed.
Hopefully you didn't hurt too much, but if you can't get oil to them with your block, I'd likely pull the intake and swap/rebuild all 8 pairs.
If you did lose one and took out the cam, I'd likely do a solid flat with tool steel lifters. long run I'd call it safer for a long hauler