Small Block ID help needed

318's didn't have a extra counter weight on the balancer like the 360's did so I'd say 360 also. The engine CID can also be found on the front drivers side of the block right below the head surface area. It is stamped in unlike the casting on the side of the block so it's usually covered with grime and impossible to read unless you clean this surface really well.

318's didn't ever use a 4 barrel either so that's another reason I would say it's a 360.