I believe that the radio was always a cost option;
I held off on posting incase anyone might have had something more substanciated to share.
I had come to understand that the early cars always came with a windshield with the embedded arial even if a radio wasn't ordered;
I have been told that the windshield in the mid(?) 1970's changed with the radio option, because cars were being ordered without a radio when people got wind that the arial was already in the car - after that point I believe that a car being ordered without a radio, could have had a radio accomidation package so that an antenna didn't need to be added to a fender (or the quarter panel).
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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