Those are some big heavy beasts. They can sit for a veeeeeerrrry long time before they get too bad too. Brother has one in his back yard a 52. Been there for more than 15 years (since my grandfather parked it when brakes went out). It hasn't been covered but still feels like just surface rust. Can't wait till my grandmother figures out what to do with it. Those are some loooong engines.
2000 Red 1SC Z28 A4 - dead for now
2005 Black GTO M6 6.0 - Split daily driver
1987 Silver Fiero GT - Split daily driver