Thanks for posting those pics of the vin #'s.
I recommend you not restore these. Whoever buys these cars will either want them in original state or a 1000 point restoration. If you did pay for a restoration, there is nothing to say you would make a profit on that investment.
If you haven’t registered them with PHS, do so. No one will buy these cars for their historic relevance without authenticating documents.
This site has more knowledgeable people and documentation of FGF's than any other site and a great place to be posting. PY might be another site to generate excitement in the Pontiac community. You would undoubtedly receive a lot of responses.
Creating a buzz in the pontiac community that these two cars might exist and be for sale is a good start to marketing. Proof needs to be established soon though (PHS). Good step posting the vin # pictures.
Of course these are just my opinions. I'm sure others will chime in.