I have the G62 in my 92" Ziroli P47 and it flies it very well and in a scale-like manner. However, it does run out of steam somewhat at the top when I do a big loop. It probably could use a little more power for those big maneuvers but I'm very happy with that plane/engine combo. My P47 is 28#, which is on the light side. I don't know anything about the Poulans, but I doubt if a 50cc would fly that plane very well. If you could find a conversion that's as big or bigger than the G62, that might work.

BTW, If you're planning on building the big Ziroli P47 consider the glass fuse. It saved me a lot of time in fuselage construction. It was my first experience with a glass fuse and I'm happy with it.

Jim