68 dart with 340 six pack

No it's not needed it was used more for run on, with the key in the start and run position it was energized and would engage the throttle arm to hold it open. When you turned the key to off it would de energize and the throttle would close off. The repop solenoid is week and doesn't have the strength to hold the throttle position. The originals if you can find one that works or a nos standard or AC brand is your best bet but they a VERY expensive!!