340 improvements with dyno numbers

And I never said I believe every horsepower claim ever. Reminds me of a time on horsepower TV when they switched fluids in the entire drive train and "found" something like 20 horse. I just don't see it. And of course I prefer independent tests. Guys with nothing to lose have nothing to prove.

What I am saying is read it, watch it, whatever, and judge for yourself if you believe it or not. Don't always assume it's going to be biased. That makes you biased. Use your head, judge from your experience. Don't let someone else give you your opinion. And most of all, educate yourself.

Back on topic. These articles are from 2001, so a lot of guys have run a combo very similar to this (Infact I run almost the same with an XE274H cam). It's a solid way to go. If you are interested, here is the second part of that article.
340 X Head Buildup - Mopar Muscle Magazine

They end up at 477hp/431tr with a port job, custom solid grind, new carb and spacer. Judge for yourself if you believe it.