1973 Ford E-100 Econoline Engine: 3.9L L6; Dealer Installed AC;. 1973 Ford E-100 Econoline Engine: 4.9L L6; Dealer Installed AC;. 1973 Ford E-100 Econoline Engine: 5.0L V8; Dealer Installed AC;. 1974 Ford E-100 Econoline Engine: 3.9L L6; Dealer Installed AC;.