This is a quick walkthrough on how to set up computer-controlled ignition timing on a Pontiac 455 with an MSD billet distributor and the MSD atomic electronic fuel injection installation. In this video, I have already installed the MSD Atomic and have been running it for months with the EFI and a mechanical/vacuum advance. To do this modification, you'll have to lock out the mechanical and vacuum advance. Only certain distributors are compatible, so check the online manual to see if your distributor is listed. I ended up swapping my distributor because I did not have the magnetic pickup 2-pin connector. I bought an MSD billet distributor to replace my MSD ready-to-run distributor.
Here is another video where I install the Vintage Air conditioning system into the same car: https://youtu.be/xqeBOstIDgY