Jon, in theory, canned goods will last indefinitely. If there is a vacuum still present, then no bacteriological action has taken place and you should be good to go. Make sure the lid is sucked down and not bulged up slighlty. Canning theoretically kills all bacteria and removes all oxygen from the container, so no biological degradation can occur.
Lid down, vacuum present, looks good, smells good, give it a try.