Owning one of these and having sourced parts from either guys here, CL, or eBay, you'd pull all the interior and exterior trim and crush the rest sadly. Just go to eBay and look at all the rear speaker grilles for sale: https://www.ebay.com/sch/i.html?_fr...&_nkw=1963+Riviera+speaker+grille&_sacat=6000 . There has to be more 63-65 Rivs parted out then there are left on the road anymore.
I had the chance twice to buy very low mileage 64 Rivs both without A/C and passed, sure wish I had jumped as the prices were less than 5 grand for rust free under 40k mile cars.
OK V-8 Buick People: I like, NO, I love junk First-Gen Rivs. The 63? nothing to talk about. Rough and due to a crap presentation a mostly unknown condition. The 64? With a SBC? A molested and very hard sell for any kinda dough. I like these cars at $2 Grand. Mitch