I just found this shot of a 5.7 rudder. The head is shaped completely different than mine. Mine must have been replaced at some point.
I will need to re-shape the head of mine. I re drilled the pivot holes so that they will come foreward, and will try to get out this weekend to try them out. I had to pull them downward 2" and they dont contact the top of the casting, so I think it may put a lot of stress on the casting if I dont extend them.