I have to agree, I consider bolt ons, to mean stock long block, untouched heads, cam, and bottem end, intake is an okay in my book, and then things like TB, MAF, etc... I would NEVER consider heads, or cam to be a bolt on!
With a stock long block, I am sure the right car/driver could go mid 12s (and some have) assuming traction, and lightweight, as well as gearing, and ALL the bolt ons. As far as your average guy, mid 13s. Then throw a shot on it, and were talking anywhere from low 13s (assume mid 13 car with a small shot) to deep 11s, and maybe better (assuming mid 12s car with a big shot)!