Here's some new info for anyone that's interested. (Cross posted from an e-mail to Mark)
I found some notes I had on the car from the previous owner. He told me that he installed a 1600 before selling it. Apparently he wanted to keep the 2.2L for another car. Too bad for me! I wish I knew more about the engine build. Like I said in the forums, this car pulls stronger than the other 1600's I've driven. The rear end is swing arm from a '62, front is from a '65 with ball joints and adjustable torsion rods. 4 wheel drums on wide 5 hubs.
Paint is excellent, only a few small rock chips. Interior also very good, some wear at left foot rest and right heel. The mahogany door rails were my own addition, one of only 2 sets I have made. I still have the originals and they will go with the car. Top, rear window and side curtains all very good. 17,572km (~11,000mi) not sure about miles on engine. I bought the car with ~6,000km, so if what the PO told me is true, it could be around 3,000mi.
This car has always been garaged, and was only caught in the rain once while I've had it. The undercarriage looks good, not spotless, but solid. About a year ago I had the throttle cable snap, so it is new. At the same time I replaced the front engine/transaxle mount since the old one looked bad. I've always kept this car well maintained, with regular oil changes and valve adjustments. I'm also including all of my VW maintenance books and such.