[flyingfrizzle]

I would set it up for a 30" leg motor if it was mine. The 25" is still ok but the higher you can get the motor out of the water the better sometimes. Also you want to measure the 300 you are going to use (not all 30"or 25" are the same) Set it up so that the motor all the way down sitting on the clamp it will set the AV plate even with the bottom of the hull. That way you can raise the motor up from there and get it to optimum height with out running out of adjustment. You will never need the motor AV plate lower than the hull bottom and with a 10" set back bracket. You may even want to start it at 1" above the hull bottom because you will gain around an inch of water height off the transom per 12" of set back. So at 10" back you will be around an inch lower than if it was directly on the transom due to the rise of the water off the back of the hull. My 25" motor AV plate ended up a bit higher than 4" above the transom bottom with a 22.5" setback bracket. Also to get a 25" motor AV plate at transom bottom usually takes a 26-27" transom height also on the boat. If you cut it at 25 inches you will max out your adjustment and still be too low possibly.