Last two things it could be - caliper spring is missing, and or the bushings for the sliding pins are worn allowing the caliper to flex a bunch. If you have the springs, get hold of a new set of caliper busings and try that (both sides)
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!