what is a slayer 600 carb ?.. my 850 double pumper holley on my 429 has only 31 squirters on it .. what you need to have is an instant gas shot the moment the throttle is moved ..there are several adjustments that can affect that .. the pre load on the pump .. the pump cam on the linkage .. the pump cam can be installed a couple of different ways .. you dont want the squirter squirting before the carb plates move .. in another words you dont want it pre loaded ...i love tuning carbs ,, you can have all the EFI you want ..