There is no question that a properly built 727 with even stock parts can withstand 1000HP and torque. The issue is the builder, the parts and how long you expect it to live.

We have several cars in the area making this power ( backed by dyno sheets not power calculators like Wallace ) that have lived long lives with stock parts.

As for funny cars back in the day - clutch is harder on the trans (clutchflite) but those cars were much lighter, tires and tracks are not what like are today. Starting line inertia is what kills some of the parts.