'The 383' ~ Getting Those True Factory Horsepower Ratings

I realize this is a 4bbl debate/post - but they also rated most of the 383 2bbl engines about 10hp less than the 4bbl engines - 2bbl engines had obviously a 2bbl carb/intake, smaller intake valves, worse exhaust manifolds, and the same cam specs as a A body 383/4bbl..

My money is on they were drunk or didn't know how to operate a dyno when they rated them, maybe both?