1969 dart 360 conversion parts needed info

You can use the /6 starter. Champion alum radiators are cheap (eBay) & their quality has vastly improved. I would get a 3 row core with the lower nipple on the pass side to use the alum pump. (check flatness of it when it arrives). For performance I would source some '92/early 93 magnum ex manifolds (they have ~2&5/16" outlets & might run $130-150 but WELL worth the money.