I think it really depends on the combo. Not sure about B bodies, but the A body SS springs came in 3 varieties IIRC (maybe 4 including the orignal Hemi SS Springs). Each flavor was the same rate but different initial arch. IIRC the 002/003 were for light cars and had the least arch.

If both springs are the same, and you think the rear is too high, then an option to investigate is dearching. Pretty sure thats what they did for the Green Brick. Beckman's Rallycuda also uses SS springs, but they carry a lot of weight on the rear and do not want the car lower than stock so they are not dearched.

Another option, possibly in conjuntion with the dearching, is a slightly higher spring eye mount (aka adjustable hanger). You'll have to measure and experiment a bit because these things effect wheel hop and spring windup as well.

If you're going to change springs, then best is to find out how much weight is on the rear wheels. Then you can come close to the height you want by calculating the free arch for a given spring rate.

Definately address the pinion angle. Front and rear u-joint angles should cancel each other out. A little nose down on the diff compensates for when it torques upward. Standing start launches usually being the worst case and so need most compensation. Speedway Motors carries 2.5" wide pinion angle wedges, or did.