quoted from Rbob over at thirdgen--
"The bird cage style sensor has a faster response time then the solid style sensor. Otherwise the temperature parameter is the same, they are interchangeable. Not sure if the connectors are the same.
For a bird cage style specify a '90-'92 Camaro w/a 3.1L engine.
For a solid style specify a '90-'92 Camaro w/a 305 or 350 TPI engine.
I have a birdcage IAT/MAT in my #8 runner in the intake manifold, also running EBL as you know. 2 wires--1 to ground the other to the pin in the ECM connector.
I would probably drill and tap a spot in the back somewhere. maybe around mid-height from the bottom of the intake to the top of the plenum where the TBI's are mounted.
you'll need to swap to a 7427 setup to run IAT, or EBL, or some code editing stuff to make it work with the 7747.
I bought mine from the dealer, where I usually buy all my sensors (more expensive, but I'd rather have genuine ACDelco parts) and mine came with the pigtail connector so I was good to go