Street Beast rear suspension setup - springs and shocks

[ziggy75]

As many of you already know, I inherited a Street Beast and recently began working on it. The rear end of this car will utilize an axle from a 94 Mustang GT. Yesterday, I pulled the axle to pressure wash and will give it a coat of Eastwood rust encapsulator and Eastwood chassis satin black. I am also planning on replacing the upper and lower control arms. While removing, I realized that the shocks were junk and one spring was broken. I believe my dads intent was to just bolt it on and replace later. Anyway, what I would like to know is what style spring should I go? If I were to go stock, I would need to purchase a set of used springs. Either Fox or SN95. If I go aftermarket lowering, then I would need to find a place that sells just the rear. Also, what style shocks should I go with? Ideally, I would rather go with a coilover setup but at this point, I am focusing my resources elsewhere.