The '67 cowl tags contain info on some options. If possible, get a picture of it before you go and decode it here. Look under the 1967 section before you get into the forums.
The drive to get there is considerable, I would want to see probably a hundred photos including many with the car on a lift. Rust and rot can still be hidden by artful picture taking, but it will still give you a better idea of what you are walking into.
1968 400 Coupe, verdoro green, black vinyl top 1968 400 Convertible, verdoro green, black top 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver)