69 Super Bee. 3" MP inboard kit. Front segment is good. Original spring was 22", SS is 20. Original hanger hole to new hole is 2" further back.

My question is where to drill rear shackle hole. I've read about 56" and 57" leaf springs. Dodge and Plymouth differences. I'm now running P3690454, P3690455 which is hard to measure curled up with no weight on them.

I plan on a pretty low ride height, even if I have to dearch the springs.

How far away from the front hole should my rear shackle tube be for a good shackle angle?

2016-10-01 22.30.35.jpg

69 Super Bee, 93 Mustang LX, 04 Allure Super