Speed Tech Lower Control Arm Clearance Problems

[astroracer]

Looking at your photo's I can see that the ball stud pivot point is well above the stud to arm interface. Compare that to your stock lower arm. Where is the pivot point on the stock arm in relationship to the ball stud to arm interface? I'll bet they are much closer together. What you have with the new arm is a bunch of extra material hanging down under the pivot point which makes for a longer lever arm. This, in effect, moves that material "farther" during suspension travel then the stock arm when articulating.
You could probably grind the lip off the outboard side of the ball stud cup but you should talk to the manufacturer before you do. All of the stress in the arm will take a path through the welds and ball stud mounting ring so removing this skirt of extra material shouldn't hurt the arm's integrity. You need to check clearances at full jounce and rebound AND full right and left lock while in jounce and rebound. You may have other issues caused by the "tall" ball stud to arm connection.
The other issue is why the wheel mounting face is moving outboard. I would verify you have the correct arm for your application before cutting it up...
How does the ball stud press into the arm? Or is it a screw in stud? It looks to me that it goes in from the top. If that is the case I wouldn't use the arm. even if it is a screw in this puts the ball stud to arm joint under tension and this will cause the ball stud to pop out after a couple of good bumps. The spring will push the ball stud and arm apart under load. Please say the stud pushes in from the bottom...
Mark