My 360 Six Pack build!!!

I only pull about 7.5" in drive at 850rpm . In park at about 1,000rpm it's at 11 or 12". I keep the initial at about 14 so I can keep the throttle blades open more. I think a lot of guys turn up the initial way to high. Not sure on your end carb jetting, I'm guessing you have metering blocks? Anyway the spread seems way to big I would go with 79/80 from what my car is doing. Make sure there is no trash in the needle and seat, if not make sure your square on all the idle transfer slots.