My 1988 GMC 3500 3+3 crew cab dually starts and idles well, but as I accelerate it cuts out and spits & spudders. After I hit 3rd gear and push th egas pedal all the way down it seems as though the 454 is starving for fuel. I have installed new: fuel tank, sending unit, and fuel pump all of which was needed anyway.

Any ideas would be greatly appreciated. Thanks gbcdude!

You're in the wrong area, but your problem is most likely a fuel pressure regulator.