3.1 to a 3.4?

I have a 90 3.1 euro, I was curious, how difficult would it be to loose the 3.1 for a 3.4? or maybe even a 3.8?? is it possible or even worth the effort? if it can be done for relativly cheap I'd like to know

It can be done for sure. Not easy, though, especially for the 3800. It's also not a cheap install, either. If you're going to do it, don't waste your time with the 3.4. Go to a salvage yard and get a 3800SC with a 4t65e transmission. The entire wire harness in the car will need to be replaced, and you'll probably have to move the battery to the trunk. I actually considered doing the switch in my '90 when my 3.1 puked, but I ended up getting a used 3.1 for free.

I dont reccomend the 3.4 switch at all. My 3.1 has all the pep I need. The 3.8 is however a good strong motor.