Paul57

If your carb is tuned correctly, the only time you may notice a difference is on cold start up...and that should be insignificant if it is tuned properly and you have a choke. On the same motor, if the AFR is the same (with carb or EFI) then the power output and MPGs will be the same...or extremely close. With all that being said...if I had a bone stock LSx motor that came with EFI I would keep it on since it is already "dialed in" to near optimum. Carbs are simple, effective and less expensive (typically)!!!