76-78 Head, Rocker Shaft Bolt Question
anyone with a part number
From the '82 FPC (which would cover your late-model parts):
Screw, rocker shaft retainer: 3870 322 (one per engine, 5/16-18 × 2.28"—might be nonstandard)
Screw, rocker shaft retainer: 0179 745 (six per engine, 3/8-16 × 1.75", full thread)
Retainer, rocker shaft, centre: 1947 617 (one per engine)
Retainer, rocker shaft, ends and intermediate: 1947 616 (six per engine)
Those retainers are the same P/Ns going all the way back to '60. Not much luck to be had shopping for these parts new, but someone ought to be able to cough any of 'em up for you on here or, more likely, on .org once it's back up and running again.