Do think three "unrestored" A-Bodies are worth $175K?

Were you "right" in what you think the cars are worth, i.e what the market will bring?
Yes.
Were you "right" in telling him.
Regardless of motive, the outcome of that is predictable.
Now, I would think the cars could not sold for that amount as they currently are.
Restored value is irrelevant, because:
1. They aint' restored.
2. Well, there isn't a number two.
So that is moot.