Factory BBP on 7.25 axle

Pick a part yards in my locality (one is 50 miles away, other 100) have very little in old mopar parts. One yard doesn't keep anything older than 1986, and the other wants sky high prices for their goods..

I found one fella that has about a dozen or so A-bodies in his pasture, most have /6 & he wants ~$800 for entire car