97 to 86 engine swap

[HISS GT]

I have a 86 4cyl that's on it's last leg and found a fully running 97 v6 (minus the front end) for cheap. How hard would it be to swap engines. The seats and 5lug stuff alone it worth more the the price of the car, so I figured why not swap engines and jump from 88hp (actually far from it) to 150hp.