I don't anymore, but at one time I owned a 1947 vintage PA-11 and tried several different engine on it over the years; 0-235, 0-290 & 0-290D2. For what its worth this was an Alaska work plane...which has some differences than hangar planes. While I'm sure I don't know everything about them, I do have around 4,000 hours of practical experience in one.
The d2 was souped up and ran like a stripped-azz ape! This PA-11 was all dolled up w/ Cub flaps, tail feather, wing tanks, big tires, heavy gear, but still fairly light wtih no electric system and bare-bones inside. From experience I can honestly tell you that it would take off and land shorter than 99.9% of other -18 150/160/180hp Cubs that I've seen or compared it against.