Replacement dizzy

There are many, many posts on this question, so please start searching and reading instead of asking people to spoon-feed you, then not look at the links they provide. A new HEI distributor for $45 is hard to beat. Pertronix Ignitor II or III is good too, but >$100 and you want a new distributor too so add that. Same deal with TrailBeast's kit.

If the P.O. did the typical hack job of wiring in the electronic ignition, I would rip that all out and simplify your wiring. If it is neat, you might keep the Mopar ignition and change parts. Post photos of what you have to help us help you.