Yep it's possible, I am almost ready to drop my 95/93 mutant motor into my 92 body with a 93 wiring harness. Are you keeping the 90 wiring harness I assume? Notice that the Air Temp Charge sensor is in different places, If you are using the 95 lower intake it has no ATC sensor on it so you will have to run wires over to your intake piping right behind the Mass Air meter. That is one thing I know is different. Also have you figured out your fan set-up? The 95 fans are electric, did you get a fan with the motor? You are losing power if you put the 90 fan on, also the pullies are different sizes, crank(sticks out farther on the 90) and waterpump, just some things to think about.