You would need to find a V-8 bellhousing for your truck. The 235 bellhousing will not bolt up to the 292, but all the 2nd.-generation sixes have the same bellhousing bolt pattern as the V-8's. Your present transmission will be a bolt-on to the V-8 housing, so the swap will be relatively simple. If you decide to go with a 283 or a 350 later, it will be a very simple conversion, involving relocating one side motor mount. Have fun!
Jerry