Thanks to many posts here I got this rig running well. Still bit of a newbie but I'm getting my hands dirty. First off, the carb rebuild (thanks to Jim C) gave it new life. Replacing the exhaust manifold gaskets stopped the surging and chitty chitty bang noises at low speeds. This rig runs better than ever-as new. I wish I had done this the day I bought the truck...you live and learn. Thanks for the great posts...couldnt of done it without them. Many happy miles ahead....