66 Dart brake swap

I,ve done the exact swap that you speak of(73 Dart disc to 66 Dart)I used the
Upper control arms(big ball joints)
Spindles
New lower ball joints
New rotors
New calipers and pads
New flex lines
Bearings and seals
Proportioning valve

Here,s a pic.
View attachment trim 028.jpg

Oh,just a heads up..If your swapping in an 8 3/4 rear,keep the driveshaft from the 73 Dart.I just bolted driveshaft in to the 8 3/4,no cutting.I just changed to bigger u-joints.

View attachment trim 029.jpg