650 Thunder AVS

I have one on mine, It runs a little rich when it is first started up, I might have the choke set a little too rich, but after that it runs great, are you sure that the choke is pulling off all the way?? I have a 1 " eddy phenolic spacer on a knockoff Airgap. oh yeah and I have a mechanical Holly fuel pump and a gauge right on the line into the carb, it runs 6-7 psi all times no regulator.