As I said before, since you asked how to best tune your LT1. The easiest path is to repin the harness for an 0411, use your existing 4x reluctor and factory ignition system. OBD2 and easy to tune, well defined PCM using the Express van tune. While you are at it delete the EGR or just leave it there for visual purposes. I actually got the idea for it from this guy when I swapped that factory 0411 equipped Astro van. 2-3 hours of harness repinning and it will run like a different car.
https://youtu.be/czLz_SAPS68
https://youtu.be/wYxaekUbseI
https://youtu.be/cgHr4F0yhd0
https://drive.google.com/drive/mobil...4B?usp=sharing
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