John,
I used Hotchkis Mustang II upper control arms. They are adjustable. Here's a link
http://www.hotchkis.net/p-587-adj-suspension-pckg.aspx
Like its already been said. The lowers are a non-stock length. If you box them. They are very strong. The problem with mine was. I had to remove the bushings to have them boxed and powder coated, but then I could not find bushing that would fit after that. So I ended up having a set of custom adjustable lowers made by a local shop (not cheap). I bought bushings for the Hotchkis lower arms and had them made based off of those. That way my upper and lower arms use stock Hotchkis bushing and are easily replaceable in either rubber or polyurethane.
Here's a pic of the custom lower arms
