RE: Eng mod?
Rodder, its a matter of perspective, to me there's all the metal in the world. You don't want to remove lots of metal just make it smooth. The area under the carb is not real important because the crank is there, and transfers the air/fuel mix to the bottom of the cyl, and that is a mess of "Upset" air. Polish the runners along side the liner, and yes you might dress port on the liner too. Remove all casting flashings.