I have had just about every combo posted above and my current combo seems to work best with the 3800# SS springs,NO SNUBBER,Rancho 9 way adjustable shocks.
It hooks with slicks and slips with MT ET streets.I used Caltracs with mono-leafs and they worked very well but the springs wore out in one season of street/strip use.
I turn a 1.49 short time the my current shock/spring package
Gus

7427766-mysavoy.jpg (59 downloads)
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60