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I think it depends on if you want to work with what you all ready have or do a swap and what you end goal is there are a few guys that have done some major work to their 4.7 ie custom sc and of course cams and other motor work
I really would be happy to get enough from the 4.7 to be satisfied and not have to deal with a swap I just am trying to see what kind of gains to expect from a cam and other performance parts for the 4.7, and if it would be worth the money
I don't know if the later heads flow that much better, but they are twin plug. H/O or 206 cams coupled with the later intake (the 08 has been superceded by the 10-11 intake) with some programming should get you some good numbers. Go to airram.com and check out some of the stuff.