1997 Chevy Cavalier 3100 V6

Chevy stopped offering the 3.1 after 1994, they offered the 2.2 OHV or the 2.4 OHC engine in 1997.

It probably would fit, but the wiring, PCM and all the electrical/suspension/steering required would be a lot of work and require fabrication.

While you could get the engine to fit, you would have to fabricate motor mounts, get new CV axles, adapt the throttle control, trans control etc, etc.

But most importantly, integrate the wiring harness for engine management and body control.

Would be a big job and lots of fabrication.

Yes.

There are many engine combos that have been adapted to fit in many different cars where the engine was not offered.

If you can find a "kit" that contains all the instructions and parts needed, you would basically be on your own.

You might try a google search, look for info on any swaps like you want.
You may find a kit or detailed instructons and parts list that gives you some indication of what you are getting into.

Not trying to discourage you, just be aware that you may find yourself in a position where you have no car that runs properly.

I have (years ago) installed turbo kits on the 2.8L GM V6.
This was a kit, that came complete with detailed instructions, all necessary parts, new PROM chip, new exhaust etc.

The kit was $3500 and would add about 70hp to the 140hp 2.8.

Yes, you would simply be swapping engines. Contact your local junkyard and see what they have with regard to used engines.

Your owners manual should contain the desired info. About HP/Torque.