Go-Verticle, Not for sure it is a Poulan as any I have looked at or converted used a beam mount. Anyway, I did a Poulan 42 for my son in his first gas plane. We had it on an old Sig Extra we poicked up. The plane had been repaired many times before we got it and with the engine it weighed almost 17 pounds. Still the engine with an 18/8 MA prop turned 8000 and pulled it straight up. I sold the engine to a guy here who put it in a U-Can-DO that weighed much less and it was unlimited. Your engine would do well in any type of aerobatic airframe in the 10 to 15 pound range provided you can balance it. I put an Echo 44 in a Wildhare 73" Edge and it was unlimited and weighed 12.5 pounds and turned a 20/8 Menz prop about 7400 RPM. I have put an Echo 21cc weedeater motor in a Seagull Models 60 size Edge and it flew fine. Wouldn't hang on the prop but I was trying to prove a point that a gas engine on a 60 size plane will work. Way cheaper than a 1.20 OS 4-stroke too. Carb and prop with a good muffler are the things to concentrate on.

Tim