I know it's a big chunk of change, but the Speartech harness is really worth it.
I would also be careful in bolting the motor mounts down till you have the engine in there and sorted out. I have the problem where the engine is slightly angled which caused some issues with the ds and trans lining up.
I believe Firebirds have an electronic pick up on the trans earlier than Camaro, so it's easier to play with gauges than on Camaros.
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2/20/2013: They Day the ****s Stopped
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