Whatsa,
I remember in the 80's a 427 SOHC MK IV Brian built for a customer in Germany. The customer bought the "Cammer" in the US and supplied it to Brian "ready to go", upon completion Brain test drove it and found it had less poop than a tired 289! After some trans-Atlantic phone calls the reason was discovered.....the "ready to go" Cammer was ready to go....in a supercharged drag car!
The compression ratio was in the 6.5:1 area! A quick rebuild with 10.5 pistons "woke it up" and the car went to Germany!.
Rick