Are any of the aftermarket upper control arms worth it for a street cruiser?

I have a 67' Belvedere II with a built 440. Other then upgraded sway bars front and rear and a Borgeson steering box the steering/suspension is stock. Is there much value for me in upgrading the control arms? The reason I am contemplating it is when on the highway I notice that the car gets pulled into the ruts easily and I thought more caster might help with this.