Switching from e85 to gas in 602 troubles

Switched from e85 to 93 shell gas this week,cleaned cell out and all lines took fuel filter out let it dry blew it out cause it looked good,put it back in put 20 gal. of shell 93 in fired it off sounded good but idle sounded off just a little. ran good in hot laps went out for 2 lap qualifying and stumbling and just crappy came in checked plugs all 8 were either fouled or about fouled. got it back going in feature ran good down straights but when i rolled out to set car for corner and rolled back in just stumbling til get back on straights upsetting the car making it push. The shell station had a sign on pumps saying the fuel could have up to 10% ethanol in it was this a factor because its hard to find a station that doesnt have the ethanol in it anymore oh yeah bout forgot willys 602 gas carb. is what i went to.thx

Did you swap carbs? If not you were flooding the engine, and your plugs should have also been changed to a plug more suitable for gas than alcohol.

yes sorry left that part out,went from e85 carb. to the willys 602 gas carb.

sh knight in eden has the shell gas with no ethanol,..its a lil higher a gallon...bill an steve said the rattman crate fuel was best on dyno!

thx DWB will go there and get fuel this week,anyone else had this problem or anything to put in gas to get rid of any trace of ethanol in system?thx