HEI distributor

Thanks, I know HEI is better I just can't grasp the Chrysler method still utilizing the fail point of the ballast resistor. It is going to take me a while to study your information and retrace what wiring the previous owner has in the car now. It is all encased. They do have a Chrysler version HeI distributor in place, but it is running via the blast panel with the remote 5 pin panel. We have been struggling to get this engine (440) to run smoothly without the surges. We either sacrifice idle or high speed to smooth out the engine. Vacuum advance may be one issue as well as transmission (727) set up and/or carburetor (Edelbrock Performer series 750cfm). The cam is 484/84. Sounds like I may be able to make these additions at or near the distributor. I have seen GM type distributors with no external coil offered for the 440, but they have to have the shaft extend beyond the heads to fit in place as the distributor top is 5.5" diameter for the big block application. I'll have to check a lot of their wiring to see if they may have some of what you describe in place now. We do have a tach, in dash that operates erratically and inaccurately or sometimes not at all. All of this is leading me toward an inspection of what is in place, but maybe more simply removal of it all and start new. I appreciate your info and welcome additional comments, I am getting my Mopar education on the fly.