Well it sounds like I'm too late in that you've already ordered the plug and play harness.  I couldn't justify spending the $80 to prevent cutting ONE wire.  If I remember correctly, it's the white wire (EST wire) in the ignition module harness...the white wire closest to the fire wall.  I admit it's tough to get in there to cut the wire and properly and securely splice in the T+ wires, but definately worth not spending $80.  Anyway, your choice.  Good luck.  The T+ with the LT1 MAF is a good setup...so is the Extender chip if you got that too.