Asuming the springs are for a Mustang than the total lenght should be correct. Meaning the driveshaft isn't shoved into the tranny.
Pinion angle is hard to explain. The angle off of the tranny should be equal of angle from the pinion. Don't quote me but I think yours should be around 7 degrees negitive pinion angle. Leaf spring cars use more angle. The more rigid the suspension the less negitive angle you'd need. This is figured by measuring at different points. Probably best to let a shop do it. Although it can be done in your driveway.
I think since your car has been lowered the pinion angle may be less than needed. Because the pinion would be higher up into the chassis making less angle. When you stomp the gas the pinion gear tries to climb the ring gear. (Front of rear raises.) You will definately get vibration from severe angle changes. And could cause U-joint failure. If your U-joints were old anyway, it probably didn't take much to kill them.
I think I confused myself.
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