If you still want to run Cleveland heads Edelborck makes a set that has the provisions for the srcew in plugs to install these heads on a windsor motor. Instead of making a Cleavor I am installing a 71 Boss 351C 4 barrel into a 91 GT 5spd with a TKO 600 tranny. My Cleveland has less that 30,000 miles on it when the Mustang was wrecked and the motor was given to me. The 2 barrel heads are good for a daily driven automatic car and the 4 barrel heads would be for a race car or a straight shift.