It's an oval motor. I went and built a 351W for it, dyno's at 460hp. I like the 427's but it upsets the balance of the car. Bill Cosby had a 427 Turbo automatic. He said it was the scariest car he ever drove.
Similarly to the Viper, most wreck Cobra's within minutes or miles of their 1st drive. People are just not prepared for the power levels compared to weight of the car. 0-100mph and back to zero in 6 seconds.... that's the norm. With a 427 it doesn't get faster than the small block version because of traction is an issue.