[331lxstang]

Just finished installing EFI 8 stack on my 427 dart small block so from experience-- lots of lobe separation is necessary to keep engine vacuum high. I'm running Fast ez 2.0 setup and you need at a minimum 10" vacuum for the ECM to function properly since the computer senses engine load from the vac. I went with a Flow Tech Induction cam and had Ed Curtis spec my hydraulic roller. Due to the nature of the open plenum on the eight stack intakes I ended up with 14" vacuum, enough to do the job but I had to convert to manual brakes since 18" is required for the power booster. The fast EZ 2.0 is self learning yet has the option for you to custom tune, I couldn't be happier for my first time to swap a car from carbs to EFI. Good Luck