M1 Single Plane Question

Hey Darren. If I remember my carb stuff correct, the cfm wont really matter untill you are really cranking out the RPM. Not to mention running open headers. A 600 to 650 cfm carb should be plenty depending on what RPM you want to max out at is. As for the adapter or spacer I was told once that the higher up you get your carb off the intake the better your top end. Maybe I heard wrong. Try messing with the settings on the accelerator pump especially since you already changed the shooters. If I am wrong on these ideas folks please let me know. I hate going through life with the wrong ideas coming out my yap.