early cars didnt have 4 speed autos so they didnt have the bracket welded on the frame that the later cars had, i would buy new fuel and return lines for a gn and replace them but you might be able to get around this.fuel injected tank and sending unit and fuel pump.8.5 rear maybe and 8.5 driveshaft.gn dash harness or be able to modify your malibu one to work not sure which way is easier. probably a gn exhaust system. not sure how complete your gn engine is but pretty much everything related to it is a 2 year deal 86-87 gn/t type/turbo t.
if you need some of these missing parts i can probably help. might wanna post your location for local help.