Pretty sure I found the issue.
The ECM was from a junkyard truck. The tuner was supposed to wipe the ECM file and load an LS3 config and set it up for a standalone system so I could start it. He never did that. I think he simply pulled the VATS off the ECM. Makes sense that an ECM from a 2011 truck with a 5.3 won't fire off an LS3 from a Camaro.
Sucks that its an hour drive each way to get it reflashed again. Sucks even more that I spent the last 3 days chasing the issue rather than finishing the car. Good news is I primed the engine very well while trying to crank it up and found a leak in the oil fittings before firing it off. Hopefully by Saturday I can post a video of it running.
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