eyeball the squirt & see if it appears to be of adequate duration with IMMEDIATE tip in. This is with it warmed up so it's not a choke issue correct? float level correct & initial in the ballpark? Any lean stumble issues anywhere else? Reportedly 1405's are jetted on the rich side. Yes the nozzles are interchangeable. EDIT I believe you are too lean rather than too rich & this is a pretty much stone stock 383 right? I'd put the lever closer to the fulcrum and I'm thinking float level/timing/vac leak unless the accel pump itself has a problem