I too have a 1959 3800 and went to 9.50 tires on 16.5 inch rims. They are pretty tall, although a little shorter then the 17.5 split rims that were on it.

While the 16.5 tires are getting a little harder to find (you can still buy them new for around $95), they don't cause a rubbing problem on the front end like 16 inch rims do. Sure they rub a bit when turning real tight, but overall they work better without having to use spacer washers.

Thanks,
Kerwin

1959 Chevrolet 3800 Pickup
1937 Chevrolet GC Panel
Can you still call it a barn find if it's your barn?