If so, then my might want to consider selling the 442 motor for some decent $$$, then go shopping at one of the well-known Pontiac motor builders like Butler or SD Performance in Wash state?

Besides the hassles you are going to have to make this work, such as motor mounts and most likely exhaust issues, you also need to consider things that will come up with long term ownership of a mixed makes combo like this.

Say you want to replace the distributor cap or spark plugs. Then you get to walk into your favorite Auto Parts house and get to explain to the pimply-faced kid behind the counter, who only knows what is on the computer, why you want parts for an Olds to fit a Pontiac.