FWIW I called Greg Luniac back in the day to get springs --when we discussed the car and what it was doing on 002 and 003 SS's he said man I can't improve on that keep on trucking--Nice guy and if I had an early B I think I would go with his stuff
The magic was the massive amount of engineering / time/ $$$ that Chrysler put into these parts--You can't duplicate that in the back yard man and if you do then Mopar needs you in Detroit
Bolt on--Cheap--Works should have been my only post