Al you have not seen the car and do not know anything about Corvettes as you say. The windshield framing in a Corvette can have rust and be repairable with any major replacement of steel, however it can go the other way also. You could get lucky and the car only having the top header rusted. This piece is being reproduced and is available now. I believe the corners connecting the top header to the sides is available as well. The best way to inspect windshield rusting is with actual windshield removed because of rust holes in the frame under the sealant holding the windshield. Any other viewing is just that. If you can get a very experienced evaluation of what this rusted windshield frame situation is, it could be expensive.