Ok so I have a 1987 Nissan 4x4 V-6 5 speed and I'd like to turn it into a project truck. My dad purchased this truck brand new in '87 and he's had it ever since. What I'd like to do is swap in a turbo 4 or 6 cylinder that will get me good gas mileage (preferably 25-30 mpg) since it will mainly be used to go back and forth from work. I'd also like it to have a little power behind it too, around 200 rwhp. Does anyone know of someone who has attempted this before? Any ideas on what sort of engines I would be looking at for this?
Yes I'm a

to Nissans but I do have a 340hp Mustang so I do know the basics.
Thanks,
Nic