50 Ford running poor at higher rpms....

[ford38v8]

Assuming that your electric pump is properly located near the tank, and that it has performed well for you in the past, I would check the fuel filter for debris, and the pressure regulator for 2 ~ 3 lbs pressure. I'd then take off the line to the carburetor, direct it into a clear glass bottle, and observe for volume and air bubbles. If volume is low, invest in a Shewman flex line, which you should have anyway. Beyond that, it gets more expensive and labor intensive.