Re: 1957 evinrude 10 hp, fuel pump conversion
To be honest, it is pretty tight. Add that to the tension of the hoses, and there is no mounting required really. A little silicone wouldnt hurt anything though. I didnt want to bolt through the pan myself, but that is up to you.
There is more room in the cowl than the smaller hp motors, so if you want it bolted up, there are more options.