General Help Tuning?

[90Vette]

Thanks for the help.

Which table do you refer to as O2 switching points? "Fast O2 Rich/Lean Threshold Vs. MAP"?

EDIT:
I was looking at my PE tables, and I realized that on the stock BIN for a '90 Corvette the PE AFR ranges from (assuming a realistic coolant temp) 9.96:1 at 3600 RPM to 13.25:1 at 1200 RPM. I've heard that 12.5:1 is usually ideal for making power, but the stock tune stays below 12:1 from 2800 RPM up. Why would GM have this so rich, and should I change it to 12.5:1?

PE Table.PNG