You can't just switch from 2BBL to 4BBL, it requires a new manifold. To keep emissions happy, you'll need to do a bunch of work making sure you match the factory emission control layout. Edelbrock Performer carbs and intakes are 50 state legal replacement parts, but only if they don't disable existing emission controls. If there are any computer controlled functions on your stock carb, the new carb must also have them, and aftermarket carbs don't, so you may be sunk right off the bat.quicksilver3602003 said:do you have the EXACT same carb? of just switched from 2-4 br... and is 4br alot better?