1970 challenger 340 6 pack TA

It does appear to be a t/a from the picture I saw. Know you need to be checking the vin numbers, the numbers on the cowl, the fender tag, and the engine and trans numbers.
The engine should be a 340t/a motor and that would make a big difference over a regular 340. If it all checks out and is solid as you say it looks to be a good deal. Looks like it may have the original tires on it. You just need to do some more looking.
Matt