My brother had a '77 with the 400 Lean Burn. The computer was on the back of the air cleaner housing. It had electronic ignition. No points. I would suggest that you get on some Mopar forums. You can always swap in a HellCrate motor.
![EEK!](images/smilies/eek.gif)
It's only $20,000.
https://jalopnik.com/the-mopar-hellc...u-d-1819971951