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« on: March 15, 2024, 09:33:18 AM »
Kevin,
Just to amplify Cory's response, I believe that the only difference between the manual and automatic versions, other than the dashpot, are the jets. The booster venturi assemblies appear to be the same between the two. The flow rate is either 595 or 600 CFM, depending on which source you read.
As for the spacer, Cory is correct, you'll need one or have massive vacuum leaks. Looking at the underside of the carburetor, you'll see that it is not flat and that the Cobra intake manifold mounting pad does not extend to out to the limits of the Autolite's base. I think I used a Canton Racing Carburetor Spacer, 85-154, available from Summit Racing. It is made of phenolic, is 1/4 inch thick, and lists for $35. The phenolic will also help isolate the carburetor from heat. Hope this helps.