Today’s ethanol gas in carburetors

I have steel brained line on race cars....the 71 Dart has had the same fuel line for 15 yrs now....started out with gas...then switch to e85 probably six or 7 years ago.....same fuel line...same fuel pump...Chinese version of a black holley...140 gph pump... car sits during the winter months....with e85 in tank and fuel lines......