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

Even when comparing auto to auto as already pointed out all 440s except the 6 pack came with a low stall big converter. So add the gear advantage, to the high stall, to the intake and exhaust advantage, and 300 pounds is nothing. Especially when a bunch of that extra weight is over the rear tires. The 6 pack when tuned well would run with a hemi.