Carburetor trouble

Do you have a PV on the secondary's? is the pressure drop consistent with RPM, what RPM does this happen, What size fuel line do you have? filter plugged up? filter in tank? Electric pump in the rear? mechanical pump? A lot of things can cause pressure drop but not normally carb.
PV on secondaries yes, pressure drop consistent with rpm no,eyes on the road not on tach,3/8 fuel lines, I’m going to say no filter plugged up only three thousand miles on everything from fuel tank threw the motor, electric pump in rear, fuel will at some point actually squirt up into the air filter