That carb is definately one a bunch of people would be looking for. I picked one up for my 70 on a core motor I bought at a junkyard about 5 years ago. I am amazed at what they go for now...
You know its sad when carbs go for $5000 bucks and you can part a car for more than selling the whole package. Case in point... I parted a decent GS 350 car out for over $6000 bucks and when it was together,less 1 1/4 panel on,I could only muster $1500 offers. Wasn't easy to do, but I had to go that way..
I parted a '70 SS454 Monte Carlo once for the same reason. All of the parts fit a Chevelle and were worth way more than the car -- it was all original nice and running, just a decent low mileage used car.