What a bummer but at least the LS is simple and not expensive to fix, we all run into problems when doing something like this. I don't want to 'told you so' but lubrication is crucial with the LS and, as hmd indicated, racing experience shows that an Accusump is essential unless you go dry sump. Also on mine there is a dirty big red light actuated by a 40 psi oil pressure switch as a sort of caution indicator plus a light for the Accusump.
You do have plenty of time for Bathurst though, it's just a matter of using the appropriate systems. Some even have an oil pressure data readout so that can be checked in the pits.