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

69 Cuda 440 said

The 'M-Code' 440 'Cuda was rated at 375 HP.

But later, the Horsepower was correctly factored by the NHRA down to 356 HP.

The 'A-12' 440 Six-Barrel was rated at 390 HP.

But later, the Horsepower was correctly factored by the NHRA up to 410 HP

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it may have been rated at that but have you seen original M code pipes? they are squished almost flat right after the manifold. it couldn't breathe though to make 375.