'Match Race 1969' 440 'Cuda vs 440 'Six-Barrel' Road Runner

I thought the cuda 440 was a standard 440 rated at 350 horse, due to the restrictive exhaust.

No,

In 1969 it came through from the factory rated at 375 HP
despite it's restrictive exhaust system.

NHRA re-factored it to 356 HP in the mid-1970's.