Why are 318's low HP and torque?

forphorty said
Factory hp ratings are somewhat arbitrary. You will never find a stock 2v 318 that makes 230 hp. More like 180-190.

Well, the 273 two-barrel was rated at 180 horsepower with 45 cubic inches less. A hope the 318 was putting out more than a 273 or something is really wrong.