That is a 1957 7 1/2hp. They have the ability to be great little engines. Must be run on no less than a 24:1 mixture when you get it up and running. Should have a pressure tank to run it and those tanks are bulletproof plus all the parts to service them are still available as are the parts to service the engine. Service the ignition, carb, water pump and possibly gearcase seals and you will be able to hand it down to your kids and it will still be runnable!
You are missing a few parts there but not many. For the rubber cowling mounts go to www.nymarine.ca and for all the rest of the parts go to www.aomci.org and those guys will help you out. Now, get to work!