New and Needing to Learn

Sorry for your loss. Sounds like both the cars and your father played a big part in your life. That's a lot more fortunate than a lot of people right there.

My first suggestion to you and your brother would be to buy FACTORY CHRYSLER service manuals for both cars. Not Chiltons. Not Haynes or any other cockin bullcrap, but factory. Then read them. They can give you immeasurable information right off the bat that would take years for us to impart on you here.