I have XHD leafs and Competition Engineering Slide-A-Link in my 340 4 speed car.Its stroked to a 372c.i(450hp)with a CF dual friction clutch.I have zero wheel hop with this setup.My 66 Dart with 410c.i has the Caltracs,mono-leaf and QA-1 12 way adj. shocks.The CalTracs,mono-leaf setup were 3X more expensive than the C.E.Just sayin..If limited with funds,try an adjustable snubber first.You might need new springs also,if worn out.Good luck.