I had one with a moki 180. I didn't build it but it was heavier than heck. The 180 flew it pretty good, so you want at least the same or more HP in it.

Everyone told me not to put a gasser in my Dynaflite PT 19, but I did it anyway. I went with a US 41 CC engine. Best flying combo! It is truly amazing in the air. Don't let them scare you out of it if you want to do it. Just make sure the enigne you pick isn't too much heavier than the moki 180 and has at least the same HP and maybe more. Look at the da-50. Don't remember the weight, but I know it has the power you want. It rocks!