The owner of Hillbank had a GT40 with a carb Roush motor and switched to EFI. He liked the carb motor better and switched back to a carb motor. I also drove a SPF MK111 with a 427 stroker with an EFI stack system, and my carb Roush motor pulled alot harder than the EFI motor. The EFI motor seemed to have a more controlled response through the RPM range, but it did not have the same kick in the pants feel as my carb motor.
EFI definitely has some benefits. I run EFI motors in my boats because of easy starting, and the computer being able to adjust for DA changes. I will always run EFI motors in my High performance boats, but for the Cobra I don't think it's worth the cost IMO. I also don't drive my Cobra in different elevations or drastic temperature changes though, so it is a different animal.
If possible I would drive both. I was set to drop an extra 10k on a roush IR motor until I compared the two in the real world. Kind of the same way I changed my mind about going with a BB...
