Ihmurphy, how's the 406 running? If I remember correctly you bought the 406 rotating assemby from Skip White. You had a bunch of post about your compression ratio. With your Blue Print heads your SCR was around 10.3. Does it operate good on 91 octane gas? Anyway back to your carburetor, I assumed you were using a 4150 750 cfm. I got this wesite for you to check out. SMI CarburetorSMI- Sean Murphy Induction
. He will build you a custom carburetor to your engine specs.