Forget all of that and go with the big bore ALUMINUM unit from Mopar. Found on some trucks and mini vans, you will not have a problem finding one.
After you get it, you will realize that the Mopar mounting studs on the firewall are about 1/8" narrower than the GM mounting studs. You will then either take a drill bit to them (be carefull not to take too much!) or put the cylinder in a end mill and remove some of the material.
"I ain't a killa but don't push me....."
Tupac
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