I have an EFI small block and another with a Proform 750. Hands down the Proform is more snappier. Even free revving. Granted my EFI motor is from the dark ages of EFI, that would be TBI. I kind of remember my moms IROC being responsive. Didnt get my seat time there though. She was worried about tickets and accidents and oh yeah that fleeing and eluding I got when I was 15 didnt help.