Just ran my first autocross I am hooked. need to upgrade rear suspension. have 5.7 hemi with 545rfe trans, alterkation front suspension, rear is 8.8 w/3:73. stock(original) leaf springs (50 years old) with highjacker shocks. What would be a better upgrade. composite,4-5 link. or leaf springs and what shocks if I go with leaf. All input is appreciated. I don't realy want to spend 2k on it. I know I have spent alot up front but kids are in college soooo yeh I am broke.