Daughter needs Gas mileage from 273 commando

Well ,I will drive it from time to time ( he he ) but I do plan on fixing it to where the 4 bbl. won't kick in. maybe a "Hidden" lawn mower style cable leading from the passenger comp. to Carb. secondaries locking them. Just a thought......:D
When do you plan on moving to S.C. ? Do you think the car will be too fast ?