I am trying to make up my mind so I can get this thing to a machine shop. I am torn between a 331 and 306. I will be using the stock block :slap: It will be topped off with either a KB matched to a cobra lower, or a Trick flow intake. I already have both so I wanna stay with one or the other, I really like the idea of a KB since there are no KB cars in my area. I already have a F303 cam that I bought and haven't used so I would like to use it if at all possible. Thinking about some TW heads. Any info or combinations you can suggest are welcome!!!!