C-6 Tanny rebuild or new?

[Killer50stang]

First this is for a f-150 351M and not in a mustang. The truck has sat, and I wondered if you guys thought this was a good deal?

http://cgi.ebay.com/ebaymotors/Ford...ewItemQQcategoryZ33727QQitemZ8053463906QQrdZ1

should I replace mine if it's bad or rebuild it?

Jason