Running an HP 850 on a somewhat stout 390. Might be a bit much carb for my application, but close for what it will be shortly. But I digress. Having an issue with with the primary squirter. .031" primary and .028" secondary. Engine runs fantastic, however, stumble upon acceleration. Just in the shop tipping in the throttle causes a stumble. I don't have the hood on the car and therefore I'm literally able to watch the primary squirter. Starts great for a split second and then peters out seemingly too soon. Engine wants more? I don't know the cam color, but I'll look when I have chance. Am I on the right track? Thanks, Robert.