Very Cool.
Which Size did you buy?

If you bought the .46 size I would say go with a four stroke minimum .72 size or maximum .91 MAX, some guys are doing it buts its a lot of engine for the .46 size plane.
If you bought the .60 size and you have the $$ I would go with a Saito 100 or a YS 1.10, either will turn the U CAN DO into a 3D beast.
I personally didnt have the cash at the time and went for the OS .91FS Surpass w/o the pump. THe fuel tank is mounted in the nose. It is MORE than enough engine for Torque Rolling, Knife Edge Loops, any vertical maneuver you wanna do, but I am at sea level, you may need more power if you are at higher altitude.
The other engines I mentioned will rocket the plane out of a hover and give you MEGA vertical, but they are really overkill under most normal conditions.

Go check out the 3D forum on this site. There are several threads about U CAN DOs that have literally THOUSANDS of replies that cover almost any conceivable question you may have about the plane. I am on my second one, so feel free to PM me or email I would be glad to answer any questions I may have.

Also, I have a 9C and I can probably help you setup your radio to get a good jump start on the funtions you will need to setup for the plane.