Jim, that is one beautiful Cub. I think you will like the 80 in it. I use a Bisson Pitts style muffler with clipped tips and the engine turns a Menz Standard 26x10 prop between 6100 and 6300 depending on the humidity and temperature.

Here are a few shots made at Bomber Field this year of my 1/3 scale 126" wing span Hostetler Super Decathlon. It weighs 32# and is very aerobatic.

Ken