i was wondering what kind of options i had if i wanted to upgrade the 3100 in my 95 ls... thinking a 3800 would be awesome just not sure if it was a realistic possibility....

 

Its not that unrealistic. If you could find a 98-99 Z34 in the JY then you would have everything you need for a 3800 swap.

 

would there be any modifications i would need 2 make?

 

Technically, if you found a 98 or 99 Monte Carlo Z34 that was rear ended and bought the car you would have everything needed to do a 3800 swap. However, I hate telling people this but the 1995 model year is the worst/hardest year of any Monte Carlo to modify. That's because 95 Monte's have OBD-1.5 and 96+ Monte's have OBD-II. In other words, you're going to have to completely rewire the whole computer system in a 95 Monte. That's VERY hard work for a car that's only worth about 2 grand.

I'd just look for a 98 or 99 Z34 if you want a 5th gen with a 3800 in it. They typically sell for 2.5-5 grand depending on condition. Then you'll have no headaches that can come by swapping engines, especially that extensive of a swap.

 

I am not sure how much you would actually have to rewire. It would depend on where the PCM was located. OBD1.5 Used the same connector as OBD2, and most of the interior wiring would have nothing to do with OBD in the first place. If you did find a parts car that was rear ended as suggested, you would have the correct dash harness from the car anyways, so you could swap that over as well.

That being said, if you don't have a lot of work/money into your car now, it might be a good idea to save the money for a 98 or 99 LTZ/Z34 rather than put the money into your car to turn it into one.