96-98 2V 4.6's were rated at 215hp, while the 99+ are rated at 260hp. If you buy an earlier 4.6, you will need to do the 99+ head swap to get good power out of it.
There is less difference in the 4V 4.6's - 305hp rating for 96-98, 320hp for the 99 and 01.
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