Traction issues

I had the wheel spin issue with my duster. I like more of a "G" machine so while messing around one day I "rebuilt" my rear springs from 2 sets of old used ones. I have 6 leafs per side with a "extra" front segment. In the front I have the .89" bars and a 1 1/8" sway bar and also have a 3/4" bar in the rear. kyb shocks all around and rubber in all the bushings but the strut rods and sway bars. With a 300hp 360 and 4sp and 3.91 I had to try and spin the tires. and Thats with 255-60-15 Cooper Cobras not the "stickyest" tire out there. I think the stiff front segment of the leaf springs was the key to traction. Now if you go to the drag strip u need drag tires as the dissimular compounds do not like to stick and you will spin for ever. LOL