I just grind until I break through on the short stands, machine some aluminum spacers use a bit of sealer on them and run it. Same thing on early W-2's.
I proposed doing that to a set of heads for someone, they chickened out tho',lol! I may be doing a set for Myself for a 360 headed for the Duster's engine bay, guess I'm
up for Guinea Pig duty :), I was going to use a steel insert tho'.