70" 340 vs 72" 340 specs please

Net Hp the engine has all the accessories attached, factory engine tune and exhaust so pretty much the way it sit in your car, gross hp has no standard it's any the manufacture wants to do it, it could be with no or some accessories, open manifolds or even open headers and performance tune or they could rate it with an all out lie Dodge seemed to under rate their engine and Chev seemed to over rate.