Leaf spring question..

Is the tension of the leaf springs from a 1964 V6 greater or equal to some 1966 gt spings?

My situation is that the car was orginally a v6 and was convertered to a v8. When the rear end was swapped out I used the v6 leaf springs.
Now I've put on some 17x8 torque thrust and Im rubbing when I go over a speed bump or driveway. Its isnt a major rubbing but wouldnt like to ruin my tires.:notnice:

So now im thinking of installing these '66 leaf springs with new Polyurethane Energy Suspension Leaf Spring and Shackle bushings hoping it would help. Im planning to instal some cal-tracs when I fall into some extra bucks!:nice:
 
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