The hole that is circled is supposed to be blocked off by the gasket.

It is not part of the normal coolant flow path.

F9CA4579-3D5B-492F-B677-8D75D6601D92.png

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