Welcome from just a little north. Nice looking Dart. Ether front suspension system is a good piece. I would think over your trans brake on the street idea. Maybe look into a A518 for drivability.
Welcome to the site, lots of people from this site in the area. I'm southeast of Denver in Strasburg. I was thinking about that car and where it went to. Plans for the car?
Find a donor car for the parts you need, 74 -76 dart or duster. Other parts will work but you will need more research. I used 88 Grand Fury front brakes. Tube type upper control arms. Rear diff out of an 75 Dart.