Is my rear end strong enough

74 Duster full interior.
We call it the trainer car because you have to learn how to cut lights before you get in one of the faster cars.

8 1/4 rearend with 3.91 gears and sure grip.
Smog engine with a few up grades.
Runs 12.21 off the juice and 11.59 with 100 hp of juice.
Well over 300 pass's with the 8 1/4.
Waiting for it to brake.
Road hard and put away wet.
3200 lb car.

Trainee Jon.