Fuel Blowing Out Carb Vent Tubes Under Heavy Throttle: Expert Opinions Please

Plan is to run just the electric pump (bypassing the mechanical) through the Holley billet regulator, then vice versa as I've ditched the fluctuating junk pot metal Holley regulator. Tinkering is on hold for a few days, but plan was to hit strip this coming weekend. Hope I can get it sorted, and do some carb tuning finally!​