79 rr drag car ?

What yr of Cuda and what rear end did ya break. Over the years I ran big old heavy RR's and Chargers all with 440/833/dana 60 never broke a thing (did however fried a few clutch discs) and oh yea a Super B and it was real nasty. Switch to an auto and unless you're pushing 600 HP a 489 or 742 8 3/4 should survive even with stickies.