I think you are missing the point. Yes, you are over the weight limit of the wheels when they were new much less 15-20 years later. They were early tech CF wheels that had some issues. Even Spinergy's website has special mention of the Rev X wheels:
http://www.spinergy.com/catalog/tech/tech_v2.php They appear to want riders to really REALLY check the wheels all the time looking for cracks. To me that is pretty damned telling, when a manufacturer is specifically mentioning a wheel and telling you to check it all the time because there might be issues with it.
Why would someone want a set of wheels that are prone to failure just for looks is beyond me unless the bike is going to sit in a shop window never to be ridden but who wants a bike that will never be ridden?
There are much better wheelsets for the same money as a used set of Spinergy Rev X wheels.