I sold a 67 date coded 440 with matching 727 years ago on craigslist for 500 bucks. Some guy from Washington came all the way down here to Arizona to get it. He needed it for the whole date code thing, his car was a 67 Coronet.
Yes, if it's not cracked. If you don't hear it run or tear it apart to see how would you know? No way would I ever lay down that kind of money unless it either had a guarantee in writing or I could pull it apart and check it out.