need help with a Holley carb

run on is timing, I would get a timing light on it . usually its because the timing is too advanced. get that sorted out first and then go to the carb. ive seen this so many times to where the run on will cause a pop and spit raw fuel out of the carb. I stopped using holleys myself because they are notorious for leaks and flooding. Ive actually had 2 that started fires in 2 different cars.