We have a spring that equates out to about a 2in drop that we provide in our StreetGrip kits. They are made out of a premium, cold wound steel here in Indiana and provide a nice combination of ride quality and handling. I recently drove our 72 C10 with the StreetGrip kit on it to Dallas TX and back and the ride quality was better than that of my 2015 Camry (I know, I know..but I have an hour commute back and forth to work every day) I copied a link below for you to check out. All of the components in the kit can be purchased separately. Look over the pieces and give me some feedback if you guys don't mind.
http://www.ridetech.com/store/1973-1...ip-system.html
Feel free to shoot me a DM, Email or call me directly if any of you have any questions!