Separate deals. Pinion angle and preload are set individually with cal tracs.
I'd set the pinion at -4 and then have the drivers side bar just touching and the pass side touch plus 2-3 flats. Flats being the flat side of the adjusting nuts. That's a decent starting point.
There are situation where you want no preload in the pass bar at all and a slight air gap on drivers, don't think your Dart fits that group.
Rancho shocks, put drivers at 5 and pass at 7.
The part nobody pays attention to, most of hooking a car is forward of the rear spring front mounts.
