Dyno'd my Duster 340 how did I do?

You do want to be careful following "recipe builds". Because you use the same parts, does not gaurantee the same power. The difference between two identical builds by two different shops, is usually quite dramatic. The better equipped/more knowlegable machinist will always make much more power than the guy who orders the parts and assembles it carefully but perhaps uses older equipment and older techniques together when the same parts are used.