The new (used) exhaust manifold has been installed! Because we are still waiting for the custom built gas tank to be finished, we'll have to wait before firing her up.
This was not the sole reason for our engine troubles, but the Travco should perform better as a result. It will certainly be a joy to drive without the extra noise and exhaust flowing through the cab!
They are pretty busy here at Best Way Truck Repair. We may end up staying the weekend if they can't complete the repairs by this evening. As long as we're back on the grounds before they lock the gate, we should be OK.