500hp 408 with Hi-Po 340 Manifolds?

I don't know how many of you read the article I posted the link to, but I was surprised at the small differences in the horseower the test showed for the different cast manifolds.

318 manifolds................... 311 horsepower
360 manifolds.................. 314 horsepower
early (1968) 340 manifolds 315 horsepower

TTI headers........................327 horsepower

403 ft pounds 318 manifolds
407 ft pounds 360 manifolds
408 ft pounds 340 manifolds (1968)
435 ft pounds TTI Headers

Here's the link... http://tinyurl.com/pemfp5m

Looks like those '68 manifolds aren't worth much over 360s on a mild engine.The software is turning that eight in nineteen sixty-eight into a smiley face... that's not me.