It would be cool to see this as a grindhouse-style project, even with minimal clean-up and colour correction.
Do you think this print is in any way different, content-wise, to the other sources you have for the AIP version?
Even if the actual images turn out unusable, the print could be a good (better?) source for the soundtrack. It may also provide a verification (or not) of the frame-accuracy of your previous reconstruction.