New clutch installed and bad wheel hop?

Wheel hop is usually due to leaf springs wrapping & unwrapping. In other words, torque twists the housing up and turns the springs into an "S". Then they spring back and the cycle continues. As others have mentioned, stiffer springs and an adjustable pinion snubber can help. But shocks are important too. The stiffer the shock, the better they will control what the rear suspension is doing. The harder a car launches, the stiffer things need to be. That's why some drag cars use Super Stock springs and stiffer shocks, like adjustable Rancho shocks from a truck application. When you find the right combination, you may spin, but wheel hop will be minimized or eliminated.

A long time ago I started with SS springs on my Dart with Mopar Performance 4-speed drag shocks and slicks. But that wasn't enough. It wheelhopped under marginal track conditions. High HP, high stall converter, a lot of gear, etc. Stiffer shocks eliminated it. On rare occasions it spun, but at least it was smooth. Usually because of track prep.