I don't think you read the entire article. The engine dynoed had a final compression ratio of 10.6:1. The question to be asked is how often will you wind up a 2 ton Pontiac to 7200 RPM to get to the 400 HP mark?

For driving on the street, especially for a heavy car like yours, torque rules. I'd be hunting a high torque number low in the power band. This is typically found thru displacement (engine size).