You would be basically making your own fuel mixture of gasoline and ethanol. So the carburetor changes would be unknown. E85 isn't a replacement for race gas when mixing.

Remember, E85 (and ethanol) isn't a gasoline.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1