I have had this sort of out drive before too much rudder will bind down the universal joint some and lag the engine.
Turn fins a good thing and can be hand made to save expense will help to reduce line drag in the out drive. Ebay
sells some cheap parts could go with modern aluminum hardware and flex drive. You can get a tuned pipe cheap
too if you choose. All this gear will allow a future boat build too.
http://www.ebay.com/itm/95mm-rudder-...m-L2RuRvqbRS7w