Have you looked to see what options the DMV has about finding information from the plate?
Your car could be found by the fender tag at this point, cause your options combo is really unique. That vinyl top is pretty rare and will probably be the thing that somebody would remember about it.
I doubt this is it, but who knows:
http://www.oldcaronline.com/1969-Plymouth-Barracuda-Eugene-Oregon-for-sale-ID178236.htm
