Internal/external balancing

Captainkirk said
Yeah, like within a quarter year of production or so. Not like "between 1970 and 1973"

Reason I'm asking...building a '72 340 that came with a cast, externally balanced crank. I'm replacing it with a forged, internally balanced '69 340 crank. I need to buy a new damper that will fit the forged crank and need to know which timing cover, water pump and radiator to use.

70 and later small blocks all get the timing cover and water pump that have the outlet on the passenger side. 69 and earlier have the outlet on the driver side. So the timing cover, water pump and such should match the year of the car.