Swapping the 4.6 SOHC to a 5.4 SOHC, is as easy as swapping your 4.6 SOHC and sticking in another 4.6 SOHC-easy. Then get the intake adapter plates, or the new intake that could be on its way, and your done. The DOHC swap, won't be cheap at all. I have a 5.4 in my Saleen with intake adapter plates, I paid under 2K for it. way less if i didn't have to pay 300 bucks for shipping the motor to me. Can't beat that. One thing i would recommend but you don't have to, putting a Tubular K member in. Makes things soooo much easier, especially if you had to replace a starter or mess with the headers and so on.
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