Still using the clutch drive. Right now I have the dual downdraft Weber's mocked up sitting though the hood under the scoop so the hood closes nicely and you can't see them. In the A15 I had to down jet the carbs to make it run right so they should have no trouble working on the Z24 motor. I know Bart recommended the Holley but the Weber's are going to fit better and I think I would rather go with the mechanical secondaries. My Holley has a vacuum secondary. I am going to try and get some welding done today.