To know the exact horsepower of *your* 1967 Chevy Impala 327, you need to:
* Check the VIN: The Vehicle Identification Number (VIN) contains coded information that can help identify the engine's specifications.
* Look for the engine code: This code, usually stamped on the engine block itself (often near the distributor), will specify the exact engine configuration and its horsepower.
* Check the original build sheet (if you have one): This document will list all the options and specifications of the car as it left the factory.
Without this information, it's impossible to give you a precise horsepower figure.