Guys I need some help! Just finished a 306 build with big heads, equal length headers, single plane intake, .554 cam and a Holley 750 ultra street carb. Runs great after 2500rpm but bogs at the hit. Bogs with a 1700rpm power brake and a 2300rpm trans brake launch. I adjusted carb and timing several times with no real change. The plugs look perfect also. You guys rock so I know somebody has an answer!
Sam
Sam