Hi I have a 71 johnson 9.5, and it has a spun prop... what do you guys suggest for a replacement?? it currently has a 8 x 8 1/4 inch prop. I don't know anything about selecting a prop and am hopefully you guys can give me some advice... It will be pushing an old 14 ft lund with decoys 1 guy and a dog through a very weedy lake, it gets run about 4 miles per weekend.. thanks M