To dyno or not to dyno?

Ant said

The future upgrade funds might go to a new rear axle if my limit slip diff experiment fails with the 7.25 axle lol.

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My cousin put a stock 318 in his 1968 Dart that was an original slant six car and broke the 7.25 rear on the first launch at the track with street tires. It was not a limited slip however.