which manufacturer are you refering to? Some engines were never even available in the US, let alone with different parts...
NTM if you can use the engine as a whole and just drop it in, its a big cost and time savings. AND, Even if you are building one from scratch anyways, it would mean no buying two engines to build one or scrounging for JDM parts at god knows what cost!
You can only change the intake manifold if you are changing driveline configs to allow fitment... IIRC
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