So I figured out the problem has something to do with under hood heat affecting the Holley regulator. With both the P4070 and the P4594 I ordered, the pressure before the filter and regulator is only about 4 lbs. The 4594 was not much different than the 4070 even though on paper it is rated at a higher pressure. I ended up putting a fuel pressure gauge before the filter and regulator and then at the regulator which is how I diagnosed the problem. Both pumps were only at about 1.5 to 2 psi at the regulator with the set screw all the way in and the motor hot after driving. I think the heat was affecting the spring in the regulator. I have since installed a P4601HP which is putting out about 15psi before the filter and regulator and I was fianlly able to get the regulator to act like its supposed to and regulate the pressure to about 5.5psi which is what my Edelbrock 1406 wants. I think the fact that I have the off road needle and seats in the carburetor made it not work at the low 1.5-2psi. I will report back once I have driven it a little.