Ok we agree ( I think ) that one full thread below the stud is all that's needed. But you could drill the hole all the way through and it won't change the block strength, it's the material surrounding the stud that dictates the strength. That's what's being loaded. Ideally you would want a through hole with a nut on the back side as well. .

The weekest link is the block material, either cast or aluminum. The stud is way stronger. That's why the threads are so long, trying to distribute the load over enough material to not pull the blocks threads out.

My question about installing studs is to see if you have ever seen the stud turn as you tighten the nut. They can go from finger tight to extremely tight as the nut applies the torsional load. That's why you want it jammed against the 1st thread not the bottom taper of an unfinished blind hole.

Bottom line for the OP is bottom tap the holes.