Will after market distributor work in my car with 3.1 motor?

What is your question?

the dealer put one in my car and it is still running rich and stalling and is loud. rpm gauge has also quit working. I was told years ago that after market parts are not compatable with this car because it has a 3.1 and they did not make very many of them. Is this true? Dealer is now guessing at problem and I know it is the distributor. I have been only owner of this car. I know my car. The people working on car a very young and now they keep guessing at things and my bill keeps getting higher. They replaced ekg valve and still no difference. Your help will be greatly appreciated. Ann