I have seen the MKIV's 2JZGTE in a z31, in fact I think there's a website on that one.
I've never seen a 7MGTE in a Z31.
(My personal opinion based on working with both cars is a 7M would not be an upgrade to a VG30ET so I would not see the point in doing the swap other than the wow factor. If you compare directly, the 7M is a lot heavier and won't make much more power than the VG will mod for mod. They come with a slightly more overhead-ready fuel system and an intercooler, so power potiential on entirely stock equipment is a good bit higher.)
I've never seen a 7MGTE in a Z31.
(My personal opinion based on working with both cars is a 7M would not be an upgrade to a VG30ET so I would not see the point in doing the swap other than the wow factor. If you compare directly, the 7M is a lot heavier and won't make much more power than the VG will mod for mod. They come with a slightly more overhead-ready fuel system and an intercooler, so power potiential on entirely stock equipment is a good bit higher.)
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