I think you may be a bit behind the curve so-to-speak on what it takes in a Mopar to do what you want. What type of mechanic are you? (not snotty, I'm curious to see where you're starting from) If you are building a full car, the engine and trans are the last things to worry about. Get yourself a core block, preferrably free (cracked, holed, whatever) and get a transmission of the type you'll be using. Order the rear new from Cass Eslick (Dr Diff on line). It's cheaper, and you can order any width, suspension type, and brake pacakge you want to. You won't stumble accross a usable dana 60 for a car in a junk yard, and you'll spend more cash on converting a truck 60 for your use than Cass charges. You need the rear suspension, the front suspension, and a mock up driveline to start the project. You also ned to know what the car needs to do for you, and the approximate horsepower of the package. That's to figure out what braking systems and suspension you need. Always start with the chassis (which in Mopar's case means the bodywork and suspension).