What year D1 do you have? GEMS?
All D1's can fit the 4.6 block. It's just a matter of swapping stuff over. It's not a big deal really. But, unless you can get a heck of a deal on a 4.6, it's not worth it. You can build a 3.9/4.0 for less money, and have more HP. Just as long as the cylinder walls are in good shape....
I have a 4.6L short block out of a 2003 D2, 7k miles, and a set of 4.6 heads, 7500 miles, that can be had.....
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