Also, The Stickman on the Station Wagon Forums went and made his Oldsmobile Custom Cruiser Wagon more aerodynamic on the under-side. I'm not posting the photos here as I didn't ask him about it but here's a link, I'm sure some folks here will be interested:
Station Wagon Forums - View Single Post - 16 or 17 inch rims for 1984 Caprice?
(I was asking about other rim sizes on there too before I settled on staying with R15s.)