I built about a dozen E85 carbs and there are alot of differences.

Boosters, Metering Blocks, Needle & Seats, Floats, Squirters, Air Bleeds, Etc...

By the time you convert you are almost ahead to buy new and sell the gas stuff.

E85 takes about 35% more volume and has a different weight than gas so its a totally different calibration.

33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage