340 breaking up @ 3500 rpm

engine starts 2 brake up @ about 3500 rpm. have good fuel supply with a brand new 750 holley, 110 gph holley mech fuel pump, 6 1/2-7 1/2 psi at the carb. converted to electronic ign. have new mopar chrome module (breaks up at same rpm as orange one), accel super coil, new cap,rotor and wires. any ideas would b appreciated. thanks. big b