I can get a good deal on a 400 from a friend if I want it, and I was just wanting to try to figure out a rough cost to rebuild it. I want to put new pistons and rings in it and all new bearings of course, and I guess get the crank turned and checked. I dont want anything really radical, just something that will hold up good and make about 400 horsepower, maybe 450. I plan to try to use the stock heads but I might get them ported and polished. Im thinking around 490 lift on the cam probly a dual pattern. Maybe some roller rockers im not sure. Is 400 horsepower hard to achieve with a 400? Can anyone tell me about what im gonna spend to achieve my goal? Any hints or tips for building a 400? Ive heard of putting 350 rods in them, has anyone else heard of that before or know why its better?