Just finished the Holley Terminator EFI install on my 21' jet. 950cfm throttle body, with (4) 85#/hr injectors. Motor fired right up and idled in my driveway. Going to time it and test at the lake this weekend, hope she runs well! I don't know anyone thats ran this setup so definitely in uncharted waters.
For A/F feedback to the ECU, I cnc'd a custom aluminum spacer for the wideband O2 sensor, that sandwiches between the manifold and riser, and keeps the sensor dry.