Pick my cam?

Unfortunately the stock heads and manifolds will be a restriction so if it were me i would pick something that stock rockers and single valve springs would work with , it keeps costs down and simplifies things until later on if you decide to upgrade. I like the .528 mopar cam that was suggested above but you would need adjustable rockers and and pushrods but he pointed that out in the above response, I will probably get torched for suggesting these cams but i like both the .474 and .484 purple shafts and it requires simple rocker gear and springs. There are some other comp , lunati grinds but with the 4 speed the two purple shafts would make good power , sound good if you like a lumpy idle and should be problem free. 2.5 inch exhaust would be recommended as well as a 750 on top of the LD340