Good 400+ HP 360 build

Well although a magnum would probably be the better choice I'm going to stick with an LA 360 because I already have a brand new top end. And I'm planning on replacing the pistons anyways, I just don't want to bore it out, I would prefer to keep the stock 360 bore and stroke. I'm starting to think that 400 hp without doing that may be a bit much, would around 350 be reasonable with the right tuning and cam then?