All I could find about the fuel injections system from the Roush website (
http://www.roushperformance.com/engines/engines.shtml):
342RE:
Fuel System: Electronic Fuel Injection utilizin Roush Calibration High Output Fuel Pump w/ 1000cfm throttle body, heated oxygen sensore w/ O2 bung, TPS, IAT, ECT, MST and Bar MAP Sensor and Mallory Hyfire Ignition
427 sr/tw:
Fuel System: Holley 770 CFM carburetor w/ vacuum secondaries and electric choke