you want ATLEAST a 99+ but preferably a 2001-02 PCM if your going to run power adders at all. 1998 is what im stuck with for now and its a single year harness and pcm. wouldnt go with it unless it was free! haha
if you get the EFI connections harness and pcm standalone setup they have it pinned and the sensor plugs already in the right places(LS1 sensor placement is WAYYYY different). all you have to do is hook her up loom it the way you want and turn the key. After a tune of course.
id say go with what they offer for a stand alone harness if your gunna go that route. trying to make an LS1 engine harness standalone is no easy task and VERY time consuming. if i didnt have a 1998 car with a 1998 harness and PCM i would have gone that route and just spent the money and been done with it. alot less headaches.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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