'62 was the last year for 235 in the North American market, they were used up to the mid '70s in the South American market in vehicles manufanctured by GM do Brazil. They were also used by Toyota in the early Land Cruisers. To my knowlege, they stopped the 261 at the same time. I can't say for sure on 4x4's, but my shop teacher had a '61 3/4 ton with a 261 that was factory installed, so it may be possible.
