What is your timing ? shoot for 25 degrees at idle
Make yourself a 15 inital and 35 total mechanical curve. Add 10 deg of vacuum advance on manifold vacuum, or use a boost/start retard. Giving 10 of retard to start and run a 20-25 intial.
Carbs don't need to be altered that far from the base settings. Their Cfm rating vs jetting size corresponds to the air fule ratio.
