73 up darts will work also.Just the later knuckles are a bit taller.I run the tall ones on my 65 B body.I had the shorter A body ones on and changed them.I got better handling and more caster with the Moog problem solver upper bushings.If you run radials you want all the caster you can get.There were a few guys with the Mopar factory conversions at Carlisle a few years ago.One guy drove almost 1000 miles and had no problems.Rocky