when you put on 73+ disk brakes on an early A body (your 65), the old rim will not fit for 2 reasons.
1) the bolt pattern of the new brake rotor is 5x4.5", your old rim is 5x4".
2) the 13" stock rim will not clear the calipers either.
You will need a large bolt pattern rim for up front on your Dart. 14" stock steelies will work, but tires are harder to find. 15" are a better choice, but may look weird if paired with your 13" stock Dart rear wheels.
Is this for the wagon? If so do you have a build thread? I would love to watch this all come together.
Tim