If you have a 5 speed with a .68 overdrive like me I would go with at leased 3.73's. If I were gearing my car again i would go with 4.11's. Dont bother with the 4 link unless you turn it into a race car. Ive seen 10 second cars launching on leaf springs. Also a 750 double pumper holley will get you lots of power. the 600 edelbrock is killing your power.