The car has 27k original miles, the rear seems to sag a tad based on other swingers I have seen. I have thought about adding helper springs back there, what would you recommend?
Call ESPO Springs and Things and buy a new set of 6 leaf springs for your car (what 340 cars came with from the factory). They aren't that expensive and they aren't that hard to put on and they will solve a world of suspension problems that patches will just make worse. In my opinion you want the back wheel wells to show 1-2 inches of tire above the rim itself.
