^indeed removing the cam carriers woudl be best done with engien out of the car, as big of a job as that is…sometimes It jsut is much better and you are time/frustration ahead to just drop the engine. The most annoying part of this is having to evac and recharge the AC, everything else is hand tools, match marks, hoist and hydraulic lift table + time.
Good to know the surface is gasketed. I have not though about removing the IM to access the back of the engine, that would net a ton of room. But like you said…do you really want to do all that just to find out you cant access those lower bolts anyway? I sure dont. Its one of those things for me…a small leak almost doesnt warrant being down for 2 weeks in my garage pulling and reinstalling the engine + the money I have to pay a shop to evac and recharge the AC.