Found these after a "GM Computer" search on ebay netted an auction for tuning an OBDI E-prom, and calling the seller.
His pricing is $120 for tuning, a little steep compared to www.GMtuners.com
rate of $45, but it bulks up our option list for tuning.
The seller is from Tulsa, but he gave me two websites where we can obtain Broadcast code data, as well as the software to program ourself.
Broadcast codes: www.efitune.com/broadcast_codes/
Software for reprogramming 92-95 L67, L27'*, and 95 L36'* among many other engines: