Even for the money the car is tainted without its original trim tag, best to hot rod the car now, then who cares what it was originally.
The way I see the car now is that it is a hot rod. Unless that is a factory install Fire extinguisher, 700r4 trany, Auminum radiator w/electric fan, MSD ignition, four wheel disc brackes etc,etc. I haven't seen the car in person but like I said. I've seen quite a few cars get that kind of money that are non numbers match. I have seen cars with no tags get more then that.
There is a lot of people in the Chicago / Milwaukee area that have money to spend. A customer of mine sold a 6cyl 67 car non numbers match had a 350 motor, 350 trans,10 bolt about the same condition as that car and he got $36000 from a couple that came up from Chicago. He paid $10000 for the car put a used engine and trans. Detailed it some and made a killing. So I'm not to sure that car would be 25-30% less then his starting price.