Por15 makes a manifold repair kit.. just a different idea for you to check into.
Check with a local car paint supplier.. such as Carquest if you have those in Oregon.. or look for por15 website..

Dearborn Classics is in your area and would have a new exhaust manifold. for a cost of around $179..bonus is you could save on shipping..

There is a benifit and a down side to using a later year manifold..
You could search your local wreckingyards for a manifold from any 200 I-6 from a maverick or granada etc.. they are a little bigger and flow better than your original.. downside is you might have to go to a muffler shop and have them modify the collector pipe to match your new mainfold..

just stay away from the smog stuff.. they had some funky prechamber on them..

Nathan