Exhaust Hot Section Temperature
I'll wind this up so others can make what they will from this thread.
I ended up going with Permatex Copper. This is not a sealant but a gasket- making paste--comes in a tube. It is rated to 700 degrees (F) intermittent which is about 300 degrees higher than any of the permatex sealant products I found.
It did seal the gaps but as was suggested in several comments it smoked quite a bit. I've run the engine now for about an hour and a half so I could burn off the stuff before going out.
I think my approach is right for anyone who has a severe alignment problem. Others suggested that no sealant was necessary because any gaps would seal themselves in time. Probably true, I just wasn't sure how long that might be so I went with the permatex figuring that a sealant would handle the leak until the rust built up.
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