X 2 on the fuel pressure. Edelbrock says no more than 6.5#. I like less than 5 just to be sure. From their website: Fuel pressure should not exceed 6.5 psi. Float level should be verified to be at 7/16. Refer to supplied carburetor owners manual. Verify needle & seats are free of any debris, and have a smooth range of operation and travel. Verify floats are free of any fluid by shaking the float, or submersing it in a safe, non flammable fluid.