A lot of chambers require a pretty lean needle position, my spec II's did. My DG's were best with the needle in the middle, but when I went to the specIIs, I ends up with a much richer pilot, leaner needle position, and slightly richer main.There is also a common carb modification, known as the Dave Friest mod that uses a different style and size needle jet, needle and air jet. The result is a leaner mixture in the mid range. It made a world of difference on my 350. Good luck, you'll get it!
I wouldn't bring her home to Mama, but Mama ain't home tonight.