I've taken the cover off from the air filter in my chevy van (from the hood side) and can't get it back on. How the heck do I open the inside dashboard shroud so I can access the engine? I've undone the latches but the dash is in it's way. I've undone the screws along the windshield, and a few bolts under the dash so far, but still won't budge. (oh, it's a 350 engine)