Budget D100 360 Suggestions

The 360 2bbl cam is a little healthier than a 318 2bbl cam. If you want a mild step up from the 360 2bbl cam, I'd go with the 340 cam.
I actually had a '71 Dodge truck just like yours, only different color. I liked when you opened the hood, the fenders provided "shelves" for tools... LOL.