how to tell if 70 Dart is real 340

1970 said
I bought a 70 Swinger 340 and the fender tag and vin state it is a real 340 car. It has the ft sway bar and disc brakes. However someone told me that the ball joints dont look big enough for a V8. Can you tell me what the differences were and how I can tell beyond the fender tag and vin? I appreciate your help.

Can't always go by what parts are on the car. I once had a 70 dart with the trailer package. Fron't sway bar, HD torsion bars, HD rear springs and the car came with a S/6.