The Beaumont was a Canadian-market rebadged Chevrolet Chevelle, produced from 1966 to 1970. While the Chevelle offered a convertible option, the Beaumont did not.
The Beaumont came with a range of engine options mirroring the Chevelle, including:
* Straight-6: 230 cubic inch (3.8 L)
* V8: 283 cubic inch (4.6 L), 327 cubic inch (5.4 L), 396 cubic inch (6.5 L)
If you are interested in a specific engine size for the Chevelle Convertible, please let me know!