bracket for a23 i/o

[martin]

hi guys I know this is probably been asked a million time but I was wondering how to mount a bracket to my boat. 13degree angle and 30" setback good for bracket. also at what height from keel does one go to mount??..I am looking at a single 225 merc 25" shaft.. thanks do I need a jack plate to run in all conditions..??? thanks MJ