Cpaul, good idea, if nothing else the Valiant factory might know who specializes in brokering them, which could make for an easier sale. Apparently most of the interiors were semi-custom if requested, so if the factory can give you layout plans for that particular boat, or tell you what any of the custom options were--that's going to make it easier to sell. Well worth a call.
From the PS review they mention blistering up to 1984 but also that there's a question about whether it was the resin, or something about the layup which varied with each hull. Either way, an inspection issue but not a stopper.
Apparently Continental flies from the US (Newark NJ) directly to the DR, when they're not busy keeping folks on the runway for six hours. Most of the other carriers do a Miami-San Juan
PR- DR run or something similar requiring 2-3 aircraft changes though. (Continental, UGH.)
What Cam says about the fuel tanks is dead on. Crud in the fuel tank can ruin your day, not to mention, ruin a sea trial. Since the boat may be sitting for weeks or months once it has been put on sale, make sure the tanks are filled and storage additive is put in them--to keep the tanks clean.
These days, I think a full fuel tank is probably a real bonus on a boat, it's like playing the futures market and we all know that's only going one way with diesel.