Thats sounds like a good price. You can get overhaul kits with sleeves for around $1500. If you are having the engine rebuilt i highly recommend having the injectors extrude honed while you are at it, it's $300 well spent.
I have a 1480 engine was overhauled in 04 or 05, it might have 300hrs since overhauled, cut 500 acres of milo this year and never added any oil. Combine needs some sheet metal and auger work, over all a good machine. I bought a 1680 before the first of the year, so I would like to sell, CHEAP! Send me a message if your interested!
You should be able to find a number of B model 466's in the $4-6,000 range that were removed from trucks and are complete, the oil pan is the only problem since it is set up for a truck and not the shallow space on your combine and the existence of a manual cutoff for fuel.