Metal in oil

With shafts off that would give you opportunity to inspect springs etc. One thing tho, the factory service manual is WRONG with rocker shaft hold down bolt torque. I think FSM states 30 lb/ft, it SHOULD be 15lb/ft. Someone else please confirm this(I'm wrong lots lol)
Yeah, I think it's like 15-17. There's a range. I just forget exactly what it is. 15 would be fine. I agree with removing the rocker shafts. That way, he could 100% inspect the pushrods for contact. Sometimes you cannot see it without disassembly.