That is going to be one expensive engine. Have you looked at supercharging your existing 4.6? You can get a lot of power with just 8 psi of boost.
A DOHC engine will cost a good chunk of change. You'll need a new computer and the engine itself, not to mention a bunch of other small parts.
I would think a supercharger at $4,000 or so would be the best route, IMO.
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