I have the GP pitts with a moki 210. It's plenty of motor for this plane. I don't think there is much difference in the two planes as far as flying goes. It's a bit of a hassle having to carry two different fuels , but not a real big deal. These engines idle sweet , and have good transition. Can't tell you about the 3500 , but I do have three os 160's and they are fine engines.
JON



HOW BAD HAVE YOU GOT IT?????????????????????????????