Slant 6 4bbl Carb Selection

If you purchase a 1901, it will come with the annular boosters.
The boosters are to upgrade a performer carb.
I am confident that you will be happy with the 1901 should you go that way. I would get a calibration kit to tune it. One good thing about a carb is that it is not a maintainance part like brakes, tires and spark plugs.
Follow up question: is there a baseline tune that I can start with? Something like “bottom out the screw then turn it back so many turns out” kind of thing that will get it running without having to fuss with it? I’m not planning on putting anything on the engine until I can take it all apart and rebuild it and put it all back together with hot rod stuff, including the cam. Since I’ll be breaking in my cam I don’t wanna have to sit there and turn it over again and again without it starting and building oil pressure.