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Message: <blockquote data-quote="atlanticblue98" data-source="post: 811157" data-attributes="member: 11091">a 4.2 will drop in, with slight modifications to the fuel rail and swapping 99-00 3.8 mustang intake manifolds on. it would also need a custom tune as well because of the different injectors used in the 4.2the Windstar intake can be used if you are swapping to the 99-04 3.8 style heads, and can be used on the 4.2 engine as well.your 1998 comes with, under most circumstances, inferior head and intake designs when compared to 99-04 3.8 heads and intake as well as all 4.2 engines.it is fairly common to swap the later style heads and intakes onto a 94-98 V6, and it is called the "Splitport swap"there is a little info that can be found on this site about it, but there is tons more information on 3.8mustang.com (which is now called 3.7mustang.com, but the site is still the same) and on V6power.netsearching for "Splitport swap" should yield tons of information</blockquote>