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Stan's Headers use a tri-y setup, and they are nearly $500 a pair. That's the only commercial option. Hummer headers are the only other alternative that I know of, but they do require some slight modification from what I'm told.
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Yep. Stan's Headers are the only mfg. still offering 6.2L headers. They're a true equal-length header design IIRC. The Hummer headers aren't equal-length and aren't like high performance headers, but probably flow better than stock exhaust manifolds. The Hummer headers won't be a simple bolt-on installation, however, due to the fact the outlets will be pointing down onto the c/k series frame rails. Modifications will be necessary to make them work.
I wouldn't spend the money for Stan's headers. I would use that money for a turbo. If you could find Hummer headers cheap enough, though, that might be a good project to try out.
Casey