Well the engines were never painted orange so that's one clue that it's been out at least if not swapped with another at some point. It is a good looking car but needs alot of TLC. I'd say count on spending $10k on fixing her up(that's doing most of the work yourself and that's if you don't find a bunch more rot under that paint). So base your offer on something like that. If the seller is firm, walk away. Seems like one of those cars that has been just sitting wasting away for years with out anybody doing the things that it takes to keep it up.