H-Beam rods?

I am looking at a set of these rods. http://www.probeindustries.com/ProductDetails.asp?ProductCode=2-360-6123-2124
Would they be a good choice for a 6-71 blower engine in the 550 to 600 HP range.
The specific rods I am looking at are new, never used and about half the price of the ones in the site above.

Jack