Originally Posted by mikeg205
But doesn't the marine version on the GM have a different housing for marine specific hose connections?
Not necessarily. Some have a cap on the bypass, some are blocked off and some have no tube at all. The pump body is just a standard older-style part that was used in the '80s and '90s before they went to the kind that has a removable core (3.8L, like in a Buick LeSabre). The pump that was on my '80s Cutlass would have been a direct replacement. The only one that was non-standard for most of GM's cars was the LT-1 pump with reverse cooling, but that was still standard for the LT-1 of that vintage.
The parts that had fittings for the exhaust manifolds, etc were additional parts, not part of the pump.