How much is too much??

[Gill Oruga]

Depends on what kind of shape the main and rod bearings were. I can see a decent jump with fresh bearings happening.

Partially plugged main oil rifle?
Oil pump spool regulator scuffed?
Pickup tube oring deteriorated?

Really hard to say without looking at your old block/parts.

There was a TSB out for the oil pickup tube sucking small amounts of air due to a rubber p-clamp rubbing a small hole on the tube, but I'm sure they used the old one and it's fine.