would it be possible to drop a VQ35DE in a 1991 maxima?

[Arcenal352]

And if so, what kind of trouble do you think I'd encounter?

[MinisterofDOOM]

It's possible. Of course, with enough money, anything's possible.And that's your key word: money.

I think an easier question to answer would be "what trouble do you think I WON'T encounter?"Nothing about the swap would be straightforward. You'd need new everything, and it would require a fair bit of fabrication.

Basically: yes, it's possible.No, it's not anything close to practical.