Mopar Inheritance

BOY!! Putting a 440 into an A body is not normally "for the novice." So far as the engine, if you can find a cooperative local, and IF you can find documentation on what was put into the engine so far as pistons, cam, heads, you can UNDO that and turn it into a street engine. You might only have to change the cam. Just depends.

You could sell it but even with "ironclad" documentation, you will take a bath on the price, as people will be buying "a pig in a poke." If you do that, "figure on" disassembling the engine to let people examine parts. Pull one head, pan, etc

One of the "first things to do" is wander over to MyMopar and look around that site. There is TONS of archived info, including being able to download free service manuals and other related literature.

MyMopar - Mopar Forums & Information - MyMopar Tools/Reference

Another good information archive is the The 1970 Hamtramck Registry That site has all sorts of archived info

The 1970 Hamtramck Registry Home Page

Last, very sorry about your Dad. My father and I had no such interaction. We got along OK in later years, but my early/ teen years were a mess with him.