Just think of the quality difference of parts from 1970 to 2006 but the choice is mr floyds, for 500 maybe scoop the car up but do a bit of research on the car first ebay search and what not, if the car is solid all the way around then it may be ok, I had a chance to purchase a 71 riviera, 3000 but it had a full complete interior all the chrome, i guess it all depends on how much you want to put into it,

Definitely get an opinion from someone else that can see the car in person if you don't feel comfortable making the determination of whether it'* worth it. It'* pretty tough to judge by pictures, which is why I've never bought a car on ebay.

And what I meant by quality is the material. A lot of the reproduction parts use inferior material. For example bumpers and other metal parts often are made with slightly thinner steel.

Trim is definitely a big one though. That stuff can get ungodly expensive since a lot of it isn't reproduced unless you have a Chevelle or Camaro. If this car has all of it'* trim in good shape, you could probably get $500 out of that alone. I'm not familiar with Buick, but with Oldsmobile you can get a couple hundred bucks just for the headlight buckets, a couple hundred for a bumper in good shape, a hundred for a set of wheel well trim, etc...