There are a few things to keep in mind that no one seems to mention when they talk abouth these " cheap and easy to build "400 hp 318s. These guys are sharp tuners with years of experience and have a dyno , a luxury most of us don't have. Lacking super tuning skills and dyno time, subtract 20 hp. Add accessories, subtract another 20 hp. Breathe in hot underhood air, subtract another 10-20 hp. Something else to consider is that Westech ( where those engines mentioned were dynoed) is rumored to have a "happy" dyno. Whether that is true or not, don't expect in-car performance of your own engine to match those in magazine articles. Ever notice when a magazine puts a dynoed engine in a car and actually takes it to the track, the results are often disappointing. Then they say "Gee it made almost 600 hp on the dyno but only runs 12s". Not trying to be a bummer, i'm just saying "results might not be typical".