No matter what you do??

Can you stall the motor by turning the mixture screws all the way in?

If so, I’d say the circuits are functioning properly...... and probably need a different calibration.

If it won’t shut off by turning the screws all the way in....... then figure out where it’s getting fuel from when the screws are all the way in.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads