LostLucian

your right, think about it as a air/fuel ratio, the 350 bores allow the normal aspirated air to fit more air to as much fuel as the less airid mix in the 305 engine, however the supercharger or whatever combo of forced induction your pick solves this by shoving more air in less area, in this case, a 305 disposable engine with a supercharged carb set-up will use little amount of gas, produce more power then a normal 350. carburated versions are preferred however because its basic fact that carbs atomize fuel better then fuel injection however fuel injection is better for gas mileage. the lack of horsepower is explained by this, and the loss of torque is given here because the less bang the cylinder makes results in less torque to the drivetrain.