Anything is possible is you have the tools too. Putting in the 3.8L with need some body/frame modifications too, plus you need to think of all the electrical stuff you will need. Even if you could fit the bigger motor in, you would need a new ECM. I don't really no but you might be able to take the ECM out of the same car as the motor, but you may have to do a complete electronic thing if you choose to do it that way...