For straight top end power the huge port Cleveland 4 bbl. heads work pretty well. But for the majority of the time they're not what you want for a milder engine combination in a street driven car.
When the engine isn't going full bore all those big ports are doing is dampening signal to the carb, reducing part throttle driveability. Also, a modest cam that's appropriate for a project such as Dave has outlined won't be making power in the rpm band where the huge port heads would provide an advantage feeding only 351 cubic inches.
