1970 L78 Nova SS owner needs feedback.

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Tom, the 1970 Nova I have now is a 03C and has the cable throttle with the open air element air cleaner. Is there any way to tell if the car came originally with dual snorkel air cleaner? Also you mentioned something about changes in the door hinges during the 1970 model year. I need to find a lower right door hinge because the door check is missing. What should I be looking for? One last question, if a car came with the radio delete did it still come with the antenna in the windshield? My car looks as if the radio and speaker were added to the car but the windshield has a built in antenna. Sorry to high jack the thread but this is great information.
Mark Sheppard