my buddy wants to throw a new 400 small block bored to 406 in my blazer. (its his, and he is giving it to me) he told me he wants to wait until i get exhaust and headers first. the engine has only 7000 miles on it, and he has over 3000 dollars into it. should i go for this? (i will be putting a 4" lift with 33's eventually) if yes, what kind of headers should i get, and what kind of exhaust. he said to get one that had a pipe going out each side. websites, prices, specific models, all would be helpful. thanks a lot guys p.s : i live in nj, so emissions is a factor.