what to get for better trackin ?

I have a 97 gt , alot of bolt ons and done a full exhaust ( headers all the way back to catback) and I have 373 gears . I have lowered my stang about 1 1/2 and I am now putting on the cast/camber plates with new sturts. The problem that I have when trying to race my stang from a dead stop or moving slow is that I can not put my tires on the ground , just sit and spin!! I have been thinking about the MAC PRODUCT upper/lower control arms but I would like to know if that should fix my problem and if not what else should I do!