fuel pressure? for the racers...

That was pretty much what I was getting at, replace the regulator with something other than a holley regulator, I had similar problem when I ran them and everything was great once I ditched the holley regulator(even brand new ones) and went with a little more expensive aeromotive style. I will never run a holley regulator again, pumps are okay though. When I said all holley regulators are junk I was implying that you have a faulty or bad regulator.:thumblef: