Your Muncie M20 4-speed transmission was sold on Ebay on 9-5-10...
Transmission case is stamped: 18N339903 P8P03
Seller id: hooked95
Seller location: Red Lion, PA
Sale price: $610.00
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=250689498944&ssPageName=STRK:MEWAX:IT
Paul