I've hung them with a loop or rope around the tail nose down, a loop of rope around the prop (or mains on a tail dragger) nose up, and alternating down the basement wall - one up, one down, one up, one down, etc. Just make sure you have the fuel tank empty, plug the muffler end by stuffing a paper towel in it, and wrap some cloth around the engine to keep dirt off and anything that may drip out from dripping on the floor or what ever happens to be beneath it. I usually hang them like NCIS does, but if I have space I leave the wings on them which is where nose up, nose down on the next pays off.

Hogflyer