Good luck with your hydraulic lifters. I followed Dave's directions explicitly and battled with lifters bleeding down overnight and making a racket the next morning for many minutes after the next run cycle. Finally decided to put a mechanical cam in the truck, so at least I hear the music of all twelve not just one or two loud clacks. I think if it had a decent oiling design of the SBC with a oil passage in the pushrod the problem would be mute.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration