[sammyg2]

You would have to remove the old head stud, drill the case to a larger diameter (which may be too large for the holes in the heads), then tap the threads in the case, then insert the case saver or time-cert, what ever they are called today, then re-install the head stud.

I usually say anything is possible but if you pull this one off I owe you a beer. I'd say it would be darn near impossible.