try http://www.buicks.net

I dont think with any classic vehicle you are going to be able to do any sort of automated history report. The only organization which stores this kind of information is the dept. of motor vehicles and even with them it can be difficult to obtain!! I have tracked down past owners to a few of my cars in the past but it has taken months. I always start with the most recent owner by looking for paperwork in the glove box, insurance cards, reg. forms, etc. Alot of time they remember who they bought it from, then you try to track down the next owner and the cycle continues. With one rare Ponitac I have I actually spoke with the original owner who bought the car in 63! My point being, these previous owners or car history of classic must be searched out like a PI (private investigator) would. Good luck, its actually kind of fun once you get a couple of leads.