Setting Pinion Angle ?

Can the pinion angle be changed with non-adjustable upper control arms? If so...how? I plan on installing UMI traction bars for the lower and UMI non-adjustable control arms for the upper. I am wondering if I should exchange these uppers for the adjustable kind.
 
Get the doulble adjustables so you can set it with the control arms on the car. It would be a PITA to have to take off one end to make an adjustment, then the other side, then again and again.