As I recall the Mickey Thompson twin engine Autolite streamliner ran over 425mph in some test runs
2nd post.....
Mickey Thompson's Autolite streamliner supposedly had a 425 mph time slip but rain washed away a return run. Not sure if that's true or not. That car had two 427 SOHC engines one supercharged the other normally aspirated.
I don't know how fast Ermie Emerso went with his four engine (406ci. ea.) streamliner.