Sorry to hear you have some problems with the 10, but at least you have a game plan in place.
So, if I understand correctly, you're going to bore the old style 10 block out for a 30 over 12 piston?
Also, your old 10, do you have the mag?
Yes I have the mag coil and one of these point eleminator boxes.
Yes I have 2 HH120 motors. I found a new set of rings for $35.