Weather it has a distributor....
Really, all you would need to do it swap over all the componets from the 4.0 (intake, brackets, mounts, etc...)to the 4.6 block. Without problems, and the right tools, you can have it done in a day/day and a half.
Still, just throw a cam, lifters, headers, high flow cats, flowmaster, and maybe a new HP chip, and you have the power equel to the 4.6, for a lot less money/time. And if you really want to get creative, remove the heads, have them shaved, ported, and pollished. I say 'maybe' on the HP chip, because there seems to be so many stories on power gains. Some really feel the difference, some feel no change....But, I have never installed a chip on a Land Rover, so I'm talking from my a** on that.
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