Hey Rick, my great uncle had a GM 6 cyl, with 3 on the tree. It was always kept inside, beautiful truck. Yup, crank windows too, as those mid 60s pickups were just for function, and cheap. I always wanted to buy it from him, but lost track, and don't know what ever happened to it.
You need to get off the net, and get some miles on your truck, as I, like many, are waiting to hear the tow report with the 4.10s. :)
BTW, if I lived close, I'd be hitting you up, for a couple kick back days, sailing on that boat, sipping some cold ones!!
Jerry