I am of no help, but will be following this thread. I have a 468 that I just built about a year ago. The valvetrain started to get noisy and I assumed it was just a rocker or two that needed adjustment so I drove it till I had a chance to adjust em. Cranked it up with the valve covers off and discovered no oil flow at idle so I am gonna guess my rockers are trashed now and hopefully the pushrods are not galled up.

The plugs behind my timing covers also have small holes in them to oil the thrust bearing (retro roller cam).