For 1967, I understood that the GS400, Skylark and Special convertibles, and Station wagon shared the same boxed frame, the GS 340 had an open frame like the Special and Skylark Hardtops and 4 doors. I would expect the same rule to be consistent with earlier models with the GS400 option.
Having said that, there is a part number for the Convertible and GS Less ST400, another for them with ST400, and another for the Sportwagon with ST400, and another for the Sportwagon without ST400. These may only be very minor differences.
The service manual shows the two frames, but does not make reference to the Convertible or GS400 with the boxed frame.
http://www.teambuick.com/reference/l...files/20-a.php
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