My ski partner runs his 89 Ski Brendella on nothing but regular gas. Runs great.
Definitely install a new fuel line that is compatible with today's gasoline, soon. We replaced his a couple years ago, and the inside was collapsing, and one section was so brittle that when I bent it slightly, it broke in two.
As others have noted, never let today's fuel lay dormant and untreated for long periods in your tank or carb. Heck, even gas before ethanol was added could not remain dormant in a carb over a long winter. Back in the 80's I rebuilt many carbs that had simply become plugged up with 'varnish' left behind as the gas evaporated from the carb. Usually, a simple disassemble, clean out the varnish, replace soft parts, and reassemble.
Always run your carb dry before layup.
Very sharp looking boat you have!