if you plan to stay arround 12 pounds get 42 pounders if you plan to get more boost get little bigger like 50,55,60 pounders your chip tuner can help you to decide wich one to use all depends on the A/F
You'll need a big injector (just do it right the first time) and you will need to look into doing a full fuel system. I'll talk to you on AIM about it, I have some info for you, but I don't want the whole world knowing about it