I am not familiar with the Holley ECU, however, IIRC some of the kits allow you to target a certain AFR at WOT, so you could dial part throttle to be stoich and WOT to be 12.5 for example. I imagine that would take a decent amount of WOT time to learn though...

Good luck with it! I look forward to seeing it out there running. Saw the car Downriver or Telegraph, can't recall which...

Faster, Faster until the thrill of speed overcomes the fear of death...

71 Swinger - slowly collecting dust/parts
66 Belv. II - just a streetcar
88 Mustang - turbo LS beater