Calling all 318 guys....318 vs 5.2 magnum, info needed please

Its still more expensive to buil the 5.9 than the 5.2...i have a bunch of parts of old 318s ad 340s cranks etc...i love love the 5.9 but something tells me that a light rotating 5.2 can really be the key....*** do the 89-90 318 roller cams share the same cams than the magnums ?