You really need to see the car in-person to determine condition. The seller took the reserve off, so he knew what it was worth. No mention of original engine, usually the seller will tell you if it has a numbers matching engine. Lot of other things were not correct for the car. It did look...
Is your car an A/C car? If not, I believe you can open up the radiator core to allow for the wider size radiator. I believe that would make it 26 inches. I have a DeWitts in my 1970 Z-28, runs nice and cool.
One more thing, if your temp sending unit is located in the head next to the...