Well -
PCMForLess.com is still around and does mail order - that's how my car was tuned and zero issues in years.
Curious who else is even still out there now for LT1?
If your really looking for the best solution: convert to an LS1 ECU conversion
TorqueHead.com - they have full on kits to make it as easy as possible.
Then - you can have just about any LS1 tuner (aheem - SloHawk) tune it without issue.
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1996 Z-28: Bolt-Ons, Harwood Cowl Hood, 18" Black Z06s
2005 Subaru Legacy GT - Stage 2 - My DD
2012 Audi S4 - The Wifee's Ride (Wait - the wife drives the fastest of the stable?
)