curious about valve lash setting/check

Oh and one more thing. The torque spec for the rocker shaft bolts is WRONG in a lot of manuals. It' only 15-17 pound feet. In some manuals they have it listed as 30. They are only a 5/16 bolt and will BREAK OFF if you try to torque to 30.
Damn straight. 65 FSM has 273 @ 15 ft/lbs and to confirm that 5/16 bolts break easily under a ham fisted torque wrench, the 65 intake with its 5/16th bolts only got torqued to 270 inch lbs (or 22 ft/lbs).