B-body runs out of real estate as quick as the Challenger does. 295 is as big as I've been able to go and without SUPER careful spacing, they'll run the inner fender and frame rail like a son-of-a-gun. My fender have a noticible "pooch" to them and if we go bigger I will have to do some metal work, which I really don't want to do to my car; as I don't want to disrupt the lines any further.