rear suspension options?

I'll bet you have stock type shocks & leaf springs. Shocks aren't controlling the separation and springs may not be stiff enough. I even got wheel-hop when track prep wasn't good with SS springs, but I had the Mopar Performance 4-speed shocks. The proper adjustable Rancho truck shocks solved that problem. 4-link is too much for the street. A Cal-Trac set-up would be the most I'd consider. But they both have a lot of adjustability that you have to figure out. Adjustable front shocks can also help the overall situation as OEM type shocks can be too loose on extension & compression.