$300 1971 Mach 1 project

[mrmach1]

I'd just do the head gasket change and see how she runs. You can always do the rebuild if that doesn't work out. In my opinion you stole that car and ether way your way ahead of the game and could spend a boat load of cash on it and still come out ahead. But then opinions are like butt holes we all have them. Good luck.