Sbf 306 running lean???
I have a 306 and have a 570 street avenger carb on it. I have it at the shop on the dyno and they calle and old me it's running super lean which I truly believe because all the hesitation it was having, not bog just stop then pik back up. But they said I need to step up I have it in a light 68 mustang built c4 Hughes 2400 stall, 3.50 gear, tuned long tubes, custom cam, rpm air gap, forged pistons, 10:1 comp., ported and polished gt-40 heads.
My question is should I go double pumper or vacuum secondary??? I drive it around town no freeway or such just back roads and around town, I want it to still be streetable but I'm not worried about gas mileage. They told me I could go Holley 670 street avenger or 650 dp...