Mine was featured in "Machinery Pete" this past month. It is a 1965 Chevy and I have photos of the day we brought it home. I have it advertised for what his data base recommends, but would negotiate gladly for the best home for it. In his article, it is named "Jenny". It is a C60, 14ft. Midwest Bed and sounds a lot like your '66. It was reblocked, so there are low miles on the engine. I can send photos.
Thanks for any interest and pass it on! Nancy Reed