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Bigut,
I would say the only real reason to install a jackplate on an early 13 footer with a 15" transom would to be able to install a long shaft engine on an early boat. I would think your overheating problem would come from another reason. If you just mount the motor down on the transom, you couldn't`t be to high. Is your boat a 20" or 15" transom? You are not mounting a short shaft motor on a long shaft transom, are you? that would cause an overheating problem. You would then need a bracket with enough offset to allow you to tilt the motor up fully.

rich