back in late june, i finally got around to replacing the exhaust manifold gasket. the new one that i installed with the replacement motor got blown out - my fault, i didn't torque the manifold nuts properly, so it was a bit loose - and i was tired of hearing the loud exhaust.
of course i forgot that the long through-bolts on the exhaust manifold enter the water jacket, so i dumped a bunch of coolant before i could get the bucket under there. oh well. install went well, made sure the special nuts/washers were in the proper place, then torqued everything properly with the torque wrench. ta-dah! no more exhaust leak at the manifold.
much quieter drive now. best part was i got it done in time for the "cruise-in" at a local restaurant later that evening. sure was a hot day, though, in the mid-90s.
and, a month and a half later, still running quietly (as quietly as a spur geared, low ratio (5.83/8.11 2-speed rear), medium duty flathead truck can run).