I have a friend that I am trying to help with his truck! It has the 225CID Slant 6. He had some one put on a new Carb for him and now he say's that the truck has no power. He was pulling a trailer and the max speed was 40 MPH in 3rd gear. I'm not used to a single barrel carb. How do you adjust one of these? I can adjust the fuel air on a 2 and 4 barrel! But I did not see any adjustments on this carb except for Idle and choke. Please help me.