Thats pretty much what I did. I stuck it on a plane that I got for $30 with no cowl on it, and just ran it. Then the plane turned out to not be able to handle the motor, put it on another plane that could and it started running better with each flight.
BTW, my AYZ 20 arrived last night from VV. It looks a LOT like the DLE20, but the carb is much smoother in operation. Looks like it came with a spinner adapter too so my 4" spinner for the Stang should fit this one OK, it does not fit the DLE at all. Keeping my fingers crossed that it runs as good as the DLE does, should make the Mustang a sweet flyer.
One thing though, the motor mount included did not include the hardware, and I forget what size bolts to use for the engine to mount and mount to fuse, and want to get some on my way home tonight. I'm thinking 8-32 for the engine, and 10-32 for the fuse, but not 100% sure.