Neither one. While either head will make a street motor that will run down the road, runners in the productions heads are too small and runners in the aluminum heads are too big to be optimal.

How about blessing us with some detailed information about the use of the motor, the car it's going in, weight, gear, converter, the cam you're thinking about, intake, headers, carb, etc., etc. The more information you provide, the better answer you'll get here.