The four-door sedan would rejoin the lineup for the 1967 model year, making a total of five Skylark body styles. Beginning with the 1967 model year, only the Skylark two-door sedan would be available with the Buick V6 engine as standard. The 300 cubic inch V8 would be standard on all other models, with the exception of the four-door hardtop sedan, which came with a 340 cubic-inch-displacement V8 engine using a Rochester 2-barrel carburetor and producing 220 hp (160 kW) at 4400 rpm.
The previous Buick Skylark Gran Sport was relabeled as the Buick Skylark Gran Sport 400 to reflect its engine. The new model was the Buick Skylark Gran Sport 340,which also used the 340-cubic-inch V8 that was standard on the Skylark four-door hardtop. The Gran Sport 340 was available only as a two-door hardtop coupe.
Source: Wikipedia, 2012