I think most if not all 70 gtx's had 26 inch radiators. Also the t bars would have been heavy duty .92". The rear springs would also be heavy duty. Not that these could not have been swapped, however if they are missing this might be something to questions as to why. The other thing to check for is the 3/8" fuel line, 383 runners would have been 5/16" (at least they are on 69's that may have changed in 70). You can never be to careful when buying one of these cars.

good luck
scott