definitely worth it. Once we installed them, the car was not as violent as the Mopar super stock springs and the car left very square. Go for some good shocks as well, such as AFCO Double adjustable shocks. Keep in mind that our 69 Cuda is a little more track oriented as well. Stock leaf spring location, but caltracs and split mono leafs, AFCO Double adjustables in the rear, single adjustable shocks in the front, lite torsion bars (Mopar Drag bars) 28X9 Hoosier slicks. We also use a fairly budget 904 trans with a low gear set and a good 8" Turbo Action Converter and the car drives good and hooks dead up at the track with a 1.37 60 foot time best. Average is 1.40. I would say yes to the Caltracs and split monoleafs. They alone wont be the answer to any traction woes however. Its the total combination of carefully chosen parts.