off set upper control arm bushings worth it???

I have them in my '73 Dart. They were originally intended for installation on collision-damaged or sagged-out cars to bring the camber back within normal range. They can also be installed so as to provide more positive caster on a car in good condition, and that's how I have them in mine. They work fine and are a low-cost way of getting extra positive caster; guys have been doing this for many years.