I have a 32/36 DVG webber on mine. Redline make adaptor for them to fit the stock manifold. It makes abit of a differnce but if you were to get a new exhaust made up eg extractors and full system then it would make more of a difference.
I was planning on being different and satying with the 4ac and get all that done and getting a cam redone but for all that money i can get a 4age in and running