At first I thought they were just corroded through holes.......But looking closer they appear to be positioned vents of some kind.......
Or inputs for Vaccum lines maybe?
Hum, yes I see them now. The Jamboree edition CJ7 had a plate under the intake that was a preheater/heater for the manifold. Better atomization of the fuel was the idea. Not sure what the holes and raised areas are for on yours.