Will it do me any good to port/polish the stock LS1 heads? Or should I just bite the bullet and save up for a pair of 243 casting heads and port/polish those. I dont want to lose too much driveability. Also, my current cam is a .222 comp cam. Since I am going to replace the heads or port my current ones, I am going to go with a little bit bigger cam. I dont want to have too many issues with driveability as I said before. What do you guys recommend? I want around 400 WHP. Thanks for any suggestions.