I just sold an 89 VT1100 with 14,000 miles. They are great bikes. The early ones had 4 speed transmissions (mine did) and more power than the newer shadows (mine was claimed at 68 hp). One thing the Valk has over the shadow, at least in my view, there are three basic models of the Valk and seemingly hundreds of Shadow models.
Check out the Shadow Forum at this link. Tons of info.
http://www.valkyrieforum.com/bbs/index.php/topic,89166.0.htmlIf you end up buying the 86, you will want to spend lots of time on the forum. You will soon discover there various strengths and weaknesses.