Engine oil leaks. Options

[Keith914]

Looking for source of oil leaks on my recently built 2.4 Type IV from a '72 1.7L. Engine is clean except for; 1) one small pushrod tube connection to the engine case, 2) oil exiting where the tranny meets the engine case, 3) oil dripping from the engine tin above the pushrod tube, and 4) oil collecting on top of the engine between the carbs and near the upper case bolts on the passenger side - appears to be being blown from under the edge of the engine tin (see pic). There are no leaks from the dizzy or the oil filler area, or from the oil filter, cooler and pump area .
While diagnosis of 1) and 2) was simple, what likely is the source of oil leaks 3) and 4)?