I don't have a ci limit but i would like to stay with a sbc i don't need any more weight on the nose and my truck is cut as much as i can it has to be a full body full size truck and there is a few guys running 434 but believe it or not i can beat them and have from time to time my truck works great that most of how i get away with a 358 and win by the way its more of a bog truck with a little bit of side by side from time to time