i have 6pk on my 383. at first they seem hard to tune however, there is alot of info out there on how and what to do. mine was lean i went up 4 sizes in the center carb, from 62 to 66. adjusted the outboards mixture screws, 1/4 turn out. there is no bog no hesation. put different springs in the distributor total at 38deg by 3500. idles at 950rpm and pulls from idle with no bog or other issues. i get 15mpg with .510inch roller and eddy heads at 10.5-1. car made 300hp and 350tq on a shop dyno. point is i researched parts and learned about the carbs and timing. i'm sure that if i can do it you can also. just take your time and get some good info and help. also i run a carter hp with 5/16 line regulated at 6psi.