Whittmore welded mine up with1/4" steel plates. I welded up a set of 96s myself doing the same thing. What you need is the nickle rod with flux that does not conduct so you can weld 'down in a hole" and not worry about hitting your seats. Its really not that big a deal. Just clean your head very well slowly pre heat it and slowly weld it and let it cool slowly. You can wrap it in a heat blanket if you like.
Pontiac iron has a lot of nickle in it so it welds nicely with nickle rod.
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