Looks to be a Crane part number 688671.

.500/.500 lobe lift, 320/338 advertised, 286/306@.050, 114lsa.

.850 lift with 1.7’s
lash .026/.022

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads