is my car in any way special/rare or more valuable than any other? 70 340.

Nice Car!With the wheels?You.ll have to measure the backspacing to get a proper fit.Is the car tubbed,mini-tubbed?That era of Dart is hard to get some big meats under there without atleast a mini-tub.I advise frame connectors also,she,s gonna twist with that motor.It,s your car,do as you please,keep it safe and have fun!

No it is not mini tubbed. I'm running 255.35.20 in the rear at the moment. I used a 35mm offset wheel and bolt on 1" spacers.

The front did not require spacers, even with that offset.