[bobcowan]

Here's another thought. You're right, 3/8" is a lot. You could simply add an adjustable arm and be done with it. But, now the arms are differant lengths front to rear. That means the upper ball joint will follow a differant arc, and change things like bump steer, and camber gain while cornering.

Before you cut things apart, do some measuring. You may find that side to be more favorable for handeling. If that's the case, you can simply add a 3/8" spacer on the other side to make them equal.