Running the progressive linkage that came in the box with the Edelbrock. I have the Autometer O2 sensor as well...I have 1/2" phenolic spacers between the carbs and the Manifold. I milled down one of the billet spacers to make two 1/4", and two 1/2" air cleaner spacers to clear the linkage and fuel line. So I should be in the clear there.