you are looking for 2 holes on the driverside inner fender lip where the air cleaner used to be. Directly ahead of this on the radiator core support there should be an open hole where the fresh air intake hose would have gone. There should not be a plate there evidence or evidence that there ever was one (Like tapped holes where a sheet metal screw would have holded the plate in place). Additionally, the windshield washer hardware would have been on the pass inner fender. If your washer stuff is gone there should still be evidence that it was once there (holes, brackets, etc). Non-FI cars have a dimple on the firewall inboard of the tach cable hole. FI cars have this hole cut out for the tach cable, and no hole in the other location (sorry, this is hard to describe). FI cars have high redline tachs and non-tach drive generators (both easy to fake).
Does the car have FI emblems on the fenders? If not, can you see from the backside if it looks like it once did but they were filled? To me that would be a fairly certain sign--not many fakers would do this one.
