I had to take my 1958 Johnson boat motor to a guy that only works on old boat motors.
He rebuilt my carb and replaced all fuel lines so the old motor could run ethanol gas.
However, he told me not to use it until I had to, but all the carb gaskets and fuel lines would withstand it, if I did.
First time I used ethanol gas in my chain saws they both quit running and had to have carbs rebuilt to accept the gas. So I have had bad experience with ethanol gas, that is just my experience.
It appears others have had a much easier transition to ethanol.