Thanks all.
I measured at the chassis rails at the rear, and same thing, the left side is close to 3/4" lower.
Springs are well lubed with motorcycle chain lube, the car drives and handles great, and I put in hard chrome king pins, new front springs and the steering thingy's about 1500 miles ago. The car has 18,000 on it.I'll contact Mulfab tomorrow for recommendations.