Might need a custom oil pan. If you cant find a local fabricator let me know, I can build one for you. If you can't make the stock one work scribe the pan where it needs to be clearanced and how wide you can go to try and add more volume if need be. Take it to a fabrication shop and have them make the needed mods. You can also use cardboard and duct tape to mock up a new sump. You can go shallow and wide for more ground clearance, too. Any fabrication (chassis shop that builds race cars) shop should be able to take care of it for you if you don't have the tools or abilities. But if you are installing a GN engine in a Chevette...............you probably have the skills required.