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I made a Jig for clamping knuckles in T slots on the mill.  It's just a piece of 1.75" tube slightly shorter than the bore of the lower ball joint hole and a .25 thick washer welded on top. Drop it in the hole and it clamps the knuckle down flat on its bottom face leaving the flat top parallel to the ground.  Then the steering arm I clamp in the vice so it cant move while cutting.  It may not be the best way to do it but I've done at least a hundred that way and never had a complaint. The angle you need to be more concerned with is the rotation of the hi-steer arm around the upper ball joint.  It will effect the ackerman angle if you plan to run true hi-steer with the tie rod mounted to the new arms.  In most cases the arm will be so high that you also have to worry about TRE to tire or wheel clearance.