I know the feeling....takes a lot of elbow grease and sometimes you got to rethink it. If you are seriously selling it and had enough, I would post pics of everything on the ad and put a price using the best offer option(cheap advertisement and you are not bound to any terms until you accept them). You are not out of line on the $900,but it may be easier to sell as a package. That body shell is interesting because it is in very good condition under the windshield and wheelhouse areas. I have seen many rusted out worse in those spots. The rear tail and gutter area is a very common problem and patch panels have not been reproduced. If you are just trying to recoupe as much as possible you may consider selling the bare frame separately. I blasted and painted one and it sold for $1500 the same week(same as GTO).Good luck with whatever decision you make.