Currently running a Weber 38 and HEI mechanical distributor with no vacuum advance. They have been on the motor for 9 years no issues. I'd like to go back to the factory equipment as time goes on. I've got an 84 carburetor and the 76 ignition system, but from reading it sounds like the later ignition setup from 83 and the 76 carburetor are one of the best factory setups. What are your thoughts?