Hope I'm not too late with this, but you can call my buddy at West Coast Cylinder Heads in Reseda California. He's friends with a "metal joining expert" at Rocketdyne (built the Space Shuttle Engines). I still have friends of my dads that still work there, and I can ask them if they know someone in production that can help you.
WCCH (818) 705-5454. Tell Rich, John Stevenson Automotive thought you could help him. If not, contact me at the shop and I'll try my sources (818) 772-1737
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