i know a lifelong racer who has built and raced all the mopar examples...and he wrote a book with his results! It's not hi horsepower or a big torque number ...it's balance in the total package.
He notes in his book that the high horsepower engines he raced never E.T' d well because making hp at hi rpm usually sacrifices lo end torque.
That's why early 340 A bodies did so well with only 275hp and 340 ft. lbs.