Something is up with your regulator I bet, all these problems came after you installed that Hi pressure pump and regulator.
Its either faulty or set wrong.
Make sure your regulator is set between 6 and 7 psi and no more.
With a mechincal pump I always did this check with the engine reved up a bit , about 2500.
Also make sure the float level is below the sight plug not even with it, no fuel should come out when you remove the sight plug, lower the float level till it just barely comes out when you shake the car.
Hope this helps, Charles