Super Six Fail

Set it up on my 72, 225. New manifold, Carter BBD, Correct linkge (not a kit) and air cleaner (not stock) but it works.


I'm getting worse gas mileage than I had before. I set it up correctly, but I'm wondering if I missed anything???

4 1/4 turns off the air mix on the carb
Linkage is moving correctly
No rats nests in the manifold.