identify cast or forged

It may have a 360 balancer and or converter on it. I was thinking the 318 and 340 cast crank engines balance internally as do the forged. If that is so the converter shouldn't have any large weights on it either. (340 balancer may have designation of "cast crank")
The early 360 balancer looks the same from the front but will have material removed from the back side on one half of it.