3.8 to 4.2 swap

[bobby7821]

Im building a 95 mustang for my son the cars in need of a motor i planned to rebuild the 3.8 but i,ve research a bit on the 4.2 what i gather is that there preaty much the same engine exept the 4.2 has a longer stroke but retains the same bore i plan on useing a m90 sc supercharger set up i bought the other day i have every thing to swap it to my sons 3.8 but if i can build the 4.2 and use the supercoupe heads than i should not have any problems my ? is are the blocks the same do they share all the same mounting points will the super coupe heads work any help would be great thanks

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[NeoTokyo]

They will swap over just fine.
The SC uses stronger rods and pistons though I beleive so you might want to think about updating that area too.

[LilRoush]

A well done single port M90'd 4.2L can put down over 400 rwhp.

[Waldron93]

should be fine.. your sons lucky.. i can only swap a 3.8 for a 3.8