Just because it has an LT4 in it, it is still OBD1 readable just like a standard LT1 pre 96 would be. (to be really specific, 95 had a different diagnostic hookup than 93-94).
If your friend has a diagnostic hookup for a 95+ car, there is a way to get it to work using a paperclip and tapping into the right pins. I'm sure if you do a search on a larger board like camaroz28.com you can find this info.
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95 Z28 M6, 383, D1SC, FMIC, ect., ect., 614 RWHP with the stock PCM and pump gas!
98 Formula WS6 M6
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