exhaust port shape

hi folks i was helping a friend install a 408 magnum stroker with mopar aluminum heads on it now the exhaust ports are square BUT on the TTI 1 5/8 step headers that he bought the flange ports are round on the headers. did they give him the wrong ones? his p/n is 340aw2c3 which seemed to be for an A body with w2 heads? this just doesn't look correct