Orlando Engine Alternative

Mao, Having been a member of this Forum for 12 years I cant remember any discussions on up-rating an Orlando to a V6. There would of course be the 'issue' of marrying the engine & clutch and drive components. You might benefit by discussing this with various specialists who undertake such conversions.
You can look up the 'platform' used for the Orlando (which I think was the Delta II) and see which other vehicles used this platform and whether any of them included a V6.
Looking at the probable low value of your vehicle it may well be a matter of you spending a lot of money on a vehicle which isnt worth it but that may not be of concern to you.

You didnt complete your Sign-Up, with neither your World location stated (the forum system believes possibly UK), and your full vehicle data was not completed.
How to do this retrospectively is explained in the following link :- https://www.chevroletownersclub.co.uk/threads/helpful-guidance-using-the-forum.7141/