Nice truck! It looks a lot like mine, an 82 D150 with a slant and 833OD. It is rapidly moving up the priority list to get running again. It needs a timing chain, and while I'm in there I'll add a better cam, full super-six setup, and 2.25" exhaust. I think yours will outrun mine quite handily... :D
It's great seeing these old trucks getting a second chance on life. Mine just had a new 2bbl put on it and they did something to bypass the lean burn I think, it runs like a top!