Surging all the time

[PetieG383]

OK, here's the deal. My Malibu is surging all the time. At idle with it in park, with it in gear and with the brake on at a stop light, and even when accelerating from a stop and at steady throttle. When I say "surging" I mean it feels like it's getting a little extra gas and wants to accelerate. I can feel it lurch forward slightly, and it's more pronounced when accelerating.

Here's the specs:
350 Goodwrench engine
Eddy Performer Intake
600 Holley vac sec w/ 71's in the front. It's a single feed carb.
.443 lift/214@50 cam
Headers & Pypes duals
New Distrib, coil, cap, plug wires
Timing set at 12 initial.

I just lowered the front float slightly, and installed a fuel pressure regulator and gauge. Fuel pressure is at 8psi at idle.

What might the problem be? Blown power valve? Needle and Seat issue? The carb is only about 1 year old and has maybe 1000 miles onit. I thought about swapping out the carb with the 750 vac sec on my Camaro just to see if that makes any difference.

Any help would be appreciated.