i tightened mine to the factory spec, ~45-50lb using new rubber pads or poly pads. the plate distance to the rear end on yours could have been retightened over the years or serviced by a guy with an impact that tightened too tight.
ive used poly on one car with stock springs, rubber on another with the PTFB springs that is drag raced quite a bit at low 11's, rear hasnt moved for 6+ years now. on my lower mile, 26k, original 81 the pads have at least a 1/8" gap if not 3/16 and the rubber pad is just slightly squished.
i would stick with the factory spec, tightened evenly, not squished out or anywhere near the plates bending or touching the rear.
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