Does my 451 have to small of a cam?

Roger Price said
I did some reserch on that pete jackson gear drive and it does have Retd/Adv.marks.Iwas also told gear drive takes away 8-10hp! So I'm replacing it with a good double roller. And ya,that spacer is gone! Now,to formulate the right thumpstick.

Curious Roger, what were the diameter size of the holes in the spacer, and what are the hole sizes of the bottom side carb base.