The 426 Street Wedge was not really a performance engine based on it's specs, quite frankly it was nothing more than a passenger car 413 with a slightly bigger bore. Low profile dual plane intake, same size (small) AFB as the other street big blocks of the day, log style non HP exhaust manifolds, mild hydraulic cam, and small valve 516 cylinder heads. That said, as mentioned above, they were no slouch, plenty of torque and decent HP, just not as strong as their Max Wedge brothers or even the later year 440's (67 and up).