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I pulled 4 case studs on my last rebuild too. I'm assuming you are talking about case perimeter studs, or chain-housing studs, not cylinder head studs, right? I used time-serts, not Heli-coils. The time-serts did deepen the holes slightly in some cases, but I used red lock-tight and set the studs to the stock height, rather than bottoming them out.
I think old Mag cases are just really bad for pulled studs. The worst part is when you pull a perimeter stud just as you are finishing bolting your case together, forcing you to pull it all apart again. Not much you can do about it.
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