Most likely, however in 67, some 12 bolts were installed on non SS cars.
Quote from CRG
Most 1967 6-cylinder and 327 cars that were ordered with both positraction and axle ratios not commonly ordered in 10-bolt axle applications (2.73 and 3.55). The 2.73 ratio with positraction appears to have been only available with a 12-bolt axle in 1967, presumedly to reduce inventory. There is limited data on the 3.55 ratio axles, but it shows a mix of 10- and 12-bolt axle usage.
Check the rear axle code as Garth said. Here's the tag decode using the decoder from CRG.
Decode for body number: 018322
03C = Built the Third week of March.
67-12637 = Custom Interior Coupe.
LOS = Built in Van Nuys California.
765 = Custom Black Bucket Seats.
Z = (A50) Strato Bucket Seats (without headrests).
A-A = Car Color is Tuxedo Black
1E = (A01) Tinted All Glass
2L = (M20) 4-speed floor shifter
2G = (D55) Console front compartment
2R = (U80) Speaker rear
3S = (Z23) Interior Decor group
3D = (U29) Courtesy Lamp
3L = (Z22) Rally Sport Package
5Y = (A39) Belts All Deluxe
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