We have continuing fuel pressure problems at high RPM under load (4th gear) Putting the pressure gauge in the car we see the drops. talking to the guy who sells the tri-link we found he had the same problem and put in a second holly regulator. What it sounds like in your car is a carb problem, hence Yaw is a good person to talk to, but if you are having high speed only problems it could be your regulator. Anyone else have the high speed only problem? We are going to put two regulators in series and step it down to 2 1/2 from an initial 5 or so and hope to be able to maintain it.

Dick Plank