Any of the fuel lines that are rubber should be ok. The rubber breaking down because of the ethanol issue was addressed years ago and the problem fixed by the hose manufacturers. As with any fuel, a good filter is mandatory and for safety reasons the use of rubber hose should be kept to a minimum. Same for the carb gaskets, if they're not leaking now, I doubt they will. I would recomend using an exhaust gas analyzer on the initial tune up to get your air fuel ratio correct, then check the plug reading after some miles...