I think I would just upgrade the pistons, hone the barrels and get new rings.
You could do that easily, run MoGas and in the future, if you want to do all those other things you won't have to redo anything.
You just might be satisfied with how it flies.
Possibly get a better performing prop.
All that other stuff sounds heavy to me.
Does your MoGas have ethanol in it? If so you might want to look at anything in the fuel system that may not be compatible with it.
A&P, Tech Counselor & Flight Advisor
Multiple RV builder and currently