If I have him turn it to the lowest spot it is going to be a vestigial oil slinger (in other words quite small) and I'm not sure if that is going to cause me any issues or not...
No problem, as the slingers' intended propose was engineered in the time of the "rope" seal era.
In other words small and round or somewhat larger and egg shaped.?.... Which is preferable...?
I would prefer to prior, particularly as the machining effort to the block, producing a professional and accurate result would be more difficult.
Bonus points if you can tell me how they get like that, seems like it would take real work to machine it elliptical... <shrug>
No, it's just Chinese
I imagine that the seal diameter may not be elliptical, but perhaps just machined off center from the main journals, as this surface is machined earlier in the roughing process, and apparently the crankshaft is re-fixtured for the cutting/grinding of the mains, and not replicating the previous effort.
Scott.