1973 340 price check?

Hi all! I have a 340 with a 727 trans that's .060 over and rebuilt to stock specs. Date coded late 72 so nothing special, it came out of a 73 Challenger. Ballpark for value? I intend on keeping it for my Duster but I've been getting a few offers for it that seem awfully low to me. Just trying to get an idea on its worth.

Thanks!

-Fuzz