If you're going all the way, consider custom leaf springs. They can be made with more leaves that make for thicker packs that resist axle wrap much better than oem springs or oem replacement springs. If properly made, such custom springs would ride as well or better than stock. Custom springs can be made for drag racing in particular. Alcan Spring or National Spring are two nationally known custom spring makers. I'll leave traction aids to more knowledgeable board members. I'm more of a 4x4 truck enthusiast. 
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.
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