Exhaust Manifold problem

["DT Gebhard" <kimkell@decaturnet.com>]

Spitlisters, The manifold on my 1977 1500 has a spot where the air pump was
routed when new(it's gone now). Now the brass fitting is stripped and it
looks like this fitting is unavailable. Does anyone know what thread size
this is or a way to plug this hole all together.  Does anybody have one of
these fitting that you're willing to part with. The auto parts guy
recommended *J B weld* stuff but I'm not sure it would hold up to the heat
produced. Any ideas?
            Thanks Dave Gebhard