Had exhaust pipe welded/patched today. Muffler shop says it won't hold; header pipe is rusted through, and should be replaced. Car runs much quieter now. In fact, now other aromas and sounds are evident:

  1. Gas tank fumes are terrible.
  2. Rattle beneath right-front section is loud.

Removed fuel sender and replaced gasket with home-made version. Emptied fuel-sender float and repaired by melting plastic around crack with soldering iron. Broke the lead off the fuel sender, but seal appears OK.

Still to do:
Cracked/rusted bumper mounts (Right front wheel valance)