Stock yes. Milled 030 is the plan. L92's have a thinner deck than the cathedral heads and I've seen where once milled they won't handle as much. Looking at close to 600flywheel HP N/A plus 200 on nitrous so I'm just making sure everything's going to work out.

I later want to switch to an LS9 head so I prefer to stay with square port so I don't have to switch intakes too. Currently have an LS3 intake for the setup.

Just didn't want to throw it together without getting facts and risk lifting a head or blowing out gaskets all the time.