I check Kelley's and then I check what they are selling for on several
classifieds pages (Yahoo, classifieds2000, Epage, etc.)  I hope this works out
for you but I have to say that I think you are making a mistake.   However it
is your van and since I have never driven an aircooled Westie of old then I
really can't speak from experience as to what they are like.  I have a hard
time believing that any coolness factor could overcome the no heat, poorer
handling, less power, etc of the older buses.
But that is just me.
Ken Wilford
John 3:16