As far as I know, the new 4.6 shares nothing in common with older motors so head swaps would be out of the question.
But the 351W head swap is a common swap for better heads. Early heads (69-70) are most desirable because of their higher compression (smaller chambers). If I was in this market I would also look at World Products heads. I think they make a windsor head that is supposed to be pretty good for the money.
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