Re: new prop for '57 evinrude 35hp
Do you have a manual for the motor, it will give a list of reccomended props for that motor. It will depend on the boat that it is on, weight of load, etc... There are a few good websites , start here on iboats.
"http://www.a1discountprop.com/propellersindex.htm"
"http://www.marinedepo.com/"
"http://www.bogerprops.com/propsforsale.html"
Also try craigslist.org, for props in your area.
How deep are the chips? If your prop has any small nicks and burrs and you want to dress them up DO NOT USE A FILE. Instead, use sand paper or emery cloth. A file leaves tungsten carbide imbedded in the prop and makes reconditioning or welding at a later time harder to do. It doesn't take much to throw a prop out of balance, and an out of balance prop will destroy a lower unit. If the nicks are deep, consider having the prop reconditioned.