Which leaf springs to use?

72 Duster with a 440. Stock rear springs are soft and original. It is a street(70% street 30% track) car but being able to plant the power to the ground is important.Like to keep ride height where it is.Maybe a little lower would be ok but not any higher.

I can add/replace leafs with some of my own leaf springs I have saved if need be. Or I can buy a set of new springs and start fresh.Ride,handling,and traction compromise if you will is what I am looking for.

I have looked at the Cal Trac split mono leafs,Hotchkis,and several others.

What are you guys running and what do/don't you like about them?