best I was able to figure out, the ECM would pull almost all timing out between 1800-2800rpm and 30-75% TPS..no active knock either per logs.. fuel pressure ran 60psi the whole time..

loaded my 01 2500 suburban (6000lbs) on to my GN and did a test drive, roughly 18-19K gross night and day different with the fast ezi-efi and MSD ignition..
I get more more work done with less throttle with ezi-efi than with the oem MPFI setup