Get my car to launch better...

Okay guys, just finished some measurements. I started with the pinion snubber, put it 1/2" from floor pan.

Next was pinion angle. Pinion is down 1 degree. Engine on front crankshaft pulley is up 3.5 to 4 degrees, meaning tailshaft is down that much. I think that means I have a 4.5-5 degree down pinion according to my research on here. Cracked - I saw you helped someone else with this and said they should have a 5 degree down pinion for a street car. I'm thinking my pinion angle isn't the problem, but does it differ if I measure it at the tailshaft? I think it shouldn't matter, but I don't know how much sag and machining slop there is inside the engine/tranny assembly. Is this a good angle, or do I need to shim it and if so, how much?

I also measured my shocks. With car sitting empty shocks are 19" in length (bolt center to bolt center). I then put frame of car on jackstands and measured that the shocks were 22". Then I tried to remove bottom of shock and couldn't because it was fully extended and binding the supension from full travel. I jacked up the rear end to remove the bottom bolt of both shocks and then saw how far it would travel without binding. It measured 23" from bolt to bolt. Therefore I need a shock that gets at least 23" at full travel, unless it can spring even further than it hangs while static. Unless someone has a suggestion I'm going to ask for a dodge truck shock tomorrow at autozone and measure it and then go from there (looking for at least 24" at full travel).

I have also researched front clamps. Can I just put one on the front of each side where the second longest leaf gets close to the front hanger?

Thanks for the help, this if the first time I've really started looking at the dynamics of a rear suspension.