besides oil squirters, pistons and rods, there isnt much difference block wise. Injectors, TB, fuel pressure regulator and intake manifold are different. The IM just has the extra nipple for the BOV.
If you get the n/a engine in there, he wont be able to boost past 10-12 psi. And he'll need a 7 bolt flywheel too.
other than that, go for it.
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