If you are not connecting the tubes at the cats then there's no point reinstalling all the other hardware.. pumping air to the cats is the only reason the system exists. The motor will run fine without it too as long as any holes in the exhaust system upstream of the O2 sensor are plugged and there are no vacuum leaks. For the record the AIR system on HD trucks is configured a little differently than the 1/2 tons, instead of pumping into the back of the heads it usually goes into the exhaust manifolds by the collector, and the diverter valves are mounted on top of the engine instead of behind and beside it. There was a posting here a little while ago with pictures of the smog setup on an F250 but damned if I can find it now, maybe do a search yourself if you really want to see it.