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draginmopars said

Can I put stiffer spring rate under, the dart Since more torque engine> stroker ???Was just thinkingWE had BAD traction issues in nov 2013with stock springs, shocks, 245-60-15tried 225-60-15 et tire shook so hard the passenger widow fellthen til now,was the reason we moved the spring in to get larger tire on

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Sure, you could put a stiffer spring..that will lessen the hop, but won't do a thing to plant the tires. Remember, as the snubber pushes against the floor of the car, it's leveraging the axle housing downward. That's why you want to use long C Body shocks on a B Body and B Body shocks on an A Body. When it's all set up correctly, the snubber will literally smash the slicks downward into the pavement.
Ideal set-up is a 3 degree downward pinion angle and 3/4 inch air gap between the snubber and the floor. If a stiffer spring is desired, you can drill a second set of holes in the rear shackles and move the spring up about 3/4 of an inch. That little bit of reduced leverage goes a long way.
Clamp all of the leafs forward of the axle tight...no clamps behind it. And cross weight the car a bit. Put about 2 turns more in the driver side torsion bar than the passenger side. I use to street race Hemi stick cars back in NY, and that's about exactly how I set them up. It'll hook in a puddle of spit if ya get it right.