what front springs and front sway bar you go with depends on what motor you are going to use. if you plan on using a 289/302/5.0 then use either the 480lb rate or the 540lb rate springs in front with a one inch front sway bar. if you are going to use a 351w or 351c engine, then go with either the 540lb rate or 620lb rate from springs and one inch front sway bar. if you are going with a nig block then you want to go with a 700lb rate front spring with a 1 1/8 inch front sway bar. rear springs should be either the 4 1/2 or 5 leaf springs with a 200ib rate, and the rear sway bar should be a 3/4 inch bar. if you have the money, you might consider stepping up to a fiberglass leaf spring from flex-i-form. here is their website-http://flex-form.com/products.asp
i would upgrade the lower control arms to ones that use a spherical bearing, and add in adjustable strut rods, both of these can be obtained from opentracker racing products. this is their website Opentracker Racing Products
in the rear i would add some kind of traction bar, the two best are the shelby under ride bars or a set of cal tracs. for socks the best are konis, but you can also use KYBs for a budget build.