Unless the rules require it or you want a choke, there is No reason EVER to run a 4150 Carb, on any Street/Strip - Race Motor. A Dominator will Always be Faster. And, don't buy the "Too Big" arguments. Tuning/Boosters can be changed to tailor the air flow requirements. Also, Patrick states in the ad for those new Carbs that they are targeted for 4150 Only Carb Rule applications.