Bottom end is factory 74 crank and rods. Motor was rebuilt back in 92 or 93 with rebuilder pistons (shooting for 9.5:1, got 8.2:1 :angry7: ), and I drove it as a daily driver up until about 2000 when I traded it to a buddy. He drove the car as a weekend toy with the same motor until around 2004 when he swapped a different shortblock into the car so he could stop worrying about the numbers matching block. I put the original shortblock back in when I got the car back last year. I think he might have had the cam out when he was swapping motors, but I know he was careful to match the lifters with the original lobes, so I don't think anything went wrong there. Even if, the car probably didn't have 10 minutes of run time before new lifters went in.
Thought about the cam bearings. Wouldn't make a difference on the lifters, but it would explain the lack of oil to the rockers. Just can't believe the rockers would make the motor rattle like it is, though.