Turning a 18/6 Master Air screw at 8970/9000rpm on a G26 mag version. I do run an Abbell single stack muffler.........it raises the rpm's about 800 over stock......but it's loud!!!!
This is the best motor on your list for sure, only down sides is the weight and on your plane it's not a problem. The mag starts easy on a starter........my mag is well tuned and can be slap started in about 6 flips/slaps................starting a new not tuned mag by hand can be a headache for sure.

This motor like to start wet.........plenty of fuel,choke it well for easy starts.

Good luck.