http://www.perfeng.cc/engines.html
That is the link to all of Eric's engines. This is a 351 with .544 cams - but notice it get's as much HP as the 418 stroker! (Although not nearly as much torque). It's possible the high HP numbers are a result of something Eric did to the engine to allow it to rev a bit higher than normal. I'll have to ask.
-Adam