I've got a DLTX-10 for sale on eBay. It was rebuilt in 2005 by Robert's Carb Repair in Spencer and put in storage. It cost me $250 to have it rebuilt, and a wait of almost 4 months - bidding starts at $200 or Buy it Now for $350. If anybody's workin on an unstyled or early styled b, this could make your project jump forward a bit! I hope this post doesn't violate any rules on advertising stuff...
Here's the link:
http://cgi.ebay.com/DLTX-10-John-Deere-B-C...A1%7C240%3A1318
Thanks for looking!