i think the problem comes in when you try to make it all fit.
z32 engine bays are the shittiest cramped things on the planet, so take that, add a motor that isnt a whole lot narrower, and make it twice as long, and i can see it being a headache.

mounting radiator, intercooler, piping all that shit has to be a headache.
its not hard if you have time, but i can see it being expensive to pay to have done.

i thought about a vq z32 for a little, make it like a 2010 300zx, full restoration with new motor. wouldnt be faster, but it would be neat