Not much to look at, but here are some pic's of my '66 K10, or Model 1504 (1/2 ton, stepside, long bed 4x4). It has the stock 250 ci engine and three on the tree tranny. The only "fancy" option I see is the windshield washer.
This was a one-owner vehicle until I bought it a couple weeks ago and it was last inspected and on the road in 2008.
1966 K10 4x4 Pickup George