I have a 1980 Gran Fury squad car with a 360 4bbl Lean Burn. I have a electronic ignition conversion kit and non lean Burn thermoquad.
So my question is do I use the wiring for the computer or do I just start from scratch? What is the best way to wire up a electronic conversion from Lean Burn.

Thank you for any help given

I did this many years ago on a 76 Cordoba. It was pretty straight forward and simple. Took me under an hour. Go to the tech archives and look up elec topics. There are diagrams to help.

There's no real doing it from scratch, go back to the starter relay and leave the rest alone.
1979 had a ballast resistor in the setup. If 1980 still had the ballast resistor too half the work is already done for you.

Mopar performance engine book has the procedure for your car and many others
step by step.
it is in the book, maybe somewhere on the web

On my 79 Cordoba, my goal was to keep it original looking. I had a spare Lean Burn box, gutted it and cut the bottom to add clearance for the orange box connector. I cut off the old Lean Burn ECU plug off the circuit board and soldered to the pigtail for the electronic ignition. All the wiring needed is in the factory wire to the lean burn.
I was concerned about heat, but I think the high volume of air moving around keeps the orange box cool enough. This was done 20 years ago and I used to use the car pretty much every day back then. In theory I could swap back in another lean burn module and old distributor and go back to stock, not that I want to.

Not an absolute, but you get the full affect if you change the carb to a pre-leanburn version. The vacuum signal is opposite from the std. ignition w/vacuum advance.

I have one car I kept the leanburn hooked up, and ran a dizzy with VA and changed the carb ( as the car had sat for years and the carb was varnished up ). What a difference.

I have actually had good experiences with lean burns. I've owned 20+ Magnums and a few Dobas over the years, and have not had much trouble. Some of the Magnums I've bought have had the change done already. I certainly don't change it back.

Yes, the lean burn carbs are built to be LEAN ! . . . Changed the lean burn off the 77 New Yorker I had gotten, and used a TQ I had rebuilt, that was from a 74 440 . . . what a difference for sure !!

When they work, they work pretty well. When they go bad, chug, chug, chug. I had one go bad.

Pic of the 80 A38 Gran Fury PLEASE Love those E58's!

I did a Pertronix II swap using a single point vac adv Chrysler dist / Pertronix II kit 91381A and Pertronix Flame Thrower coil as the starting base, changed the intake out for an Edelbrock 4 bbl manifold/Holley 600 CFM on a 1980 5th Ave, just trash all the lean burn junk, no ballast resistor required, the Pertronix is very straight forward, you just need the hot ignition (run) lead..... the rest can hit the trash can

Do you mean the mopar performance one? It has everything you need.
https://www.amazon.com/Mopar-Small-Electronic-Ignition-Distributor/dp/B01FAYBAQ8
The lean burn distributor has two pick ups in it witch you are replacing so it won't be in use. Just wire up the kit.

Here's a link to the instructions for installing the Mopar Performance Electronic Ignition Conversion Kit:

https://www.mymopar.com/downloads/elecignconv.pdf

Sometimes the answers on this forum can be really confusing. Everything he needs to know is in the tech archives under "elec topics".

Also might be helpful if you post links! Didn't see any wiring/instillation links there or did i miss it?
http://www.moparts.org/Tech/
http://www.moparts.org/Tech/Archive/elec.html