Rear end advice for racing with a 4 speed

For a leaf spring car you cannot beat a S60 from Dr. Diff. The problem with a leaf spring Mopar having a back braced rear end is shock clearance. If you run the back braces all the way to the housing ends to be most effective you have to hack out big chunks of the bracing to make room for the shocks. I have been able to get away with my 8.75-742 clutch style Sure Grip because of my 235 60 14 tires. That said I have fragged a few steels in the Sure Grip on multiple occasions.