just out of curiousity, how much venturie effect do you get with annular boosters? i had a racedemon rs that i made into a 1050 downleg booster carb, the venturie effect was 0.040, had bigg trouble reading plugs, if i fitted annular boosters it was going to cut back cfm by 75, so i made it a 1025 & got 0.080 venturie effect which works well. i'm thinking 1050 annular must almost be straight venturies.