engine cutting out down track after in 3rd gear!

Fuel pressure/volume, fuel line to close to headers,(needs isolating),High resistance in ign wires ( if they are not Quality wires, i would be getting the ohms meter out and finding the bad one or two wires)

My Carter mechanical pump work grate! But i have a electric pump at the fuel tank pushing 3 psi at the suction side of mechanical pump.

A full loop system would work better, with the regulator at the carb, but it work.