I had the same issue after installing a set of lowering coils in my 71. A full tank of gas, two people in the rear seat the rear end was very low. Not to mention the same issue of the drivers side rear bumper being lower than the passenger side. I bit the bullet and purchased a set of Air-Lift bags to go inside the springs, problem solved. I usually only run about 5 - 7 psi. This will let you even things out and not worry when you have heavier than usual loads.
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71 Goatman
Hot Rods & Horsepower.......A diease for which there is no cure.
71 GTO, 463, SD 295 d-port heads, 10.75:1, RPM intake, 502hp/560tq @ the crank, 200r4, 10" Continental convertor, Bullet 234/244 cam, Cliff's Q-Jet, 3:42's w/Eaton True Trac, 5 Power Tours. New performance numbers coming 
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