Main Stud Girdle Kits

I have a theory on these. If they're not doweled to the caps and the caps to the block, what good are they? Theoretically they could walk under the girdle.Maybe my thinking is flawed. I'm building a 416 using a 69 340 block, shot peened caps and ARP studs torqued to 125 lbs then line honed. Gonna give her a whirl and see what it can hold up to without going boom. Pull it apart and check the caps for walk. If alls good I'll continue on.... if not time to tone it down and find a R3 I guess.