Eazybee
I have 2 Demon 650 cfm carbs that were bought last June and run for about 300 miles on top of a 6/71 blown 327 (That's all it took to toast the stock SBC =D> ). I have the boxes they came in and the tuning and maintainance CD that came with them along with the 2 to 1 crome plated fuel lines that attaches to each of them. The part number is 5282010BC and you can check out what you are getting on the Barry Grant website were there is a section to "Identify your Demon".
I got these in trade for some work from the previous owner. They look like new.
I'm asking $300 per carb or $500 for the pair. They go for over $500 apiece, retail.
I'm located in Fridley, Minnesota and you can call me at 612-978-8374 if you are interested.
Thanks,
Brian B.