I have purchased two IA2 blocks. John's used on the Fairmont is run dry deck and reverse cooled. His is race only with nitrous. The other is a street application in my Trans AM and it's run wet and uses smaller diameter for the water holes located near the bore. We use a Cometic gasket custom made specific for us with our own assigned part number for our hole locations and sizes. My engine builder drilled the holes based on a pattern provided to me years ago by Ken Keefer.
Not the same as our specific gasket but Cometic sells a shelf gasket with 20 percent smaller cooling holes in certain locations.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE
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