A few years ago we (me and a couple friends) pulled a decent-condition motor out of a wrecked Isuzu Trooper, and swapped it into an Isuzu Rodeo with a failed motor. The major difficulties were just stuff like some of the accessories were on the wrong side for the factory hard lines or hoses. But still, we did it in a suburban garage with far from optimal tools and a rented engine hoist and got done in two full weekends or so.
Not all engine swaps are hard, and the more you've done it the easier it gets. The larger the vehicle the better though, not such tight clearances.
But yeah, GT-R engine to 370z doesn't make much financial sense, even from a wrecked one, even if you could get it done in a few weekends.
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