Hey, unless you know for sure, it couldn't hurt to run the VIN past Larry Weiner and see if it's a GSS. The swapped top end of the engine kinda makes me wonder.
Now you've got me REALLY wondering about the car. If it was a GSS car, then what would be different about the 340? It was mentioned a few times above.... it needs a lot of time, money, and skill to bring it back from the deal. I'm lacking in two of those :) I am a body tech and have fixed worse than this. But I still need money and extra time. As if I don't have enough projects going already ('69 Charger, '69 Bee, '73 Dart Sport, and a '70 Superbird). Between my brother and I, we have enough A-body parts cars to build it back.... the right way.