Is this the type of reinforcement you are thinking of?
http://chucker54.stores.yahoo.net/coarmstpl.html
If so, probably not, unless you are auto cross, track, or drag racing. That said, it wouldnt be a bad idea to stiffen the lower control arm. I have 0.940 bars on my Dart without the reinforcement. The car is a daily driver
that is, when the sun is out , and the car handles nicely.