I told this way before in this thread!!!
If the guys want to run a 3900 he need to get a 3400 for the harness, heads/intakes/cam/t-chain components
basically you'll have a 3900''shortblock'' the rest will be 3400 or 3500
no way you can have a functionning cluster with just the 3900 harness....
well there is another way and that would be to run both harness and pcm in parallel.... (I didn't do this on my car it's kinda a hackjob, but it can work)
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