What shocks and springs for 74 Duster?

I have SS springs on the Duster and the rear end was about 6" higher so I put in lowering blocks on the axle and the ride height is about normal. I have comp engineering 3 way adjustable shocks and when I hit a bump seems like shocks bottom out. Car rides like crap.
I would like to restore to a more normal set up. Which leaf springs and shocks should I go with? And what vendor to use?

Thanks Gary