Not for convertibles only.
Here are the engine/trans breakdown for 1967 Grand Prixs with 400 engine. This includes hardtops and convertibles.
XY (400 & A.I.R. & MT) = 29
XZ (400 & MT) = 536
XH (400 & AT) = 15,467
XJ (400 & A.C. & AT) = 24,563
428 numbers are included with all full-size Pontiacs, so there are not GP-only numbers available for the big-engine cars.
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