I'm running McCoy 35 Red Heads, old school. I balanced it by the plans.
In fact the McCoy that are on the plane in the pictures is my first 35 that was given to me by my parents. Engine is 50 years old, but had to be replaced with another engine, McCoy. The original Red Head is now in a place of honor in my display case. It just didn't have enough power due to being run hard in its early life.
My Magician has a weight box, but no adjustable leadouts. Due to the wing tip configuration, I couldn't come up with a way to make 'em fit.