The 4.2L is a bored 3.8L with a different upper head. The difference between the 1997 and 2002 4.2L is that between those years Ford switched to a aluminum intake manifold. Mounting is 100% the same as the 97. I know this because my 1998 engine blew out in 2002, and was replaced with a 2002 engine with alum manifolds. (haha dirtyd, mine are alum and not plastic
)