Just a personal preference, I think a classic like yours or a cub deserves a 4 stroke to not have the scream of a 2 stroke glow.
You'll probably have to add weight with either the 2 or 4 stroke.
Forgot to mention that with your planes short nose moment, if you use a Higley Heavy Hub it'll cut down the amount of lead up front. It won't look that much out of scale in front of the prop.