No, he's saying what you have is not what you have been told. He is saying that what you have is all A body, just exactly like you would want for a bolt in. Re-real what I told you. Not sure what you have for an upper CA, you may or may not need to change that depending on the drum brakes you have. You should not need those lower arms.
Also, if you don't have, run over to
MyMopar.com and download the two volumes for the 73 factory service manual. That manual GOT there because of some of us on HERE