Jeff, set your curb idle to what you want, then slowly turn the idle mixture screws 1 at a time to just get the idle to loose about 25 rpms,do this several times to flip flop from one side to another to fine tune. If the idle speed needs to be changed do it now, then go back to the mixture screws & again try to get a 25 rpm drop on the lean edge which is turning the idle screws clockwise to lean. Doing this for years with an air fuel meter it will get you very close to an ideal setting. Since you are using an adapter you can try 59 jets in place of the 61's which come stock in a 7448-350 cfm carb. Good,luck with your installation. :idea: william