Edelbrock's "ratings" for RPM ranges are "suggested", not "in stone". This is particularly true with smaller market engines like the Pontiac. T-2 is the intake of choice for anything over 450 CID with "performance" in mind. We use it exclusively for street engines with ported heads and a "big" cam. The open plenum "softens" the low-end grunt of the bigger Pontiacs, to the point where you can get a semblance of traction. Unlike small blocks, when we say "low-end", we're not talking light-throttle drivability. That NEVER goes away... What we mean is on the "launch" at a dragstrip. Pontiacs are famous for big "wheelies" and blowing the tires off. Neither wheelies nor smoke get you "down the track" as quickly as possible.
When it comes to comparing the Pontiac to any of the Ford or Chevy offerings, there's not much "apples to apples". The 454 can make the torque, but at the cost of high-end power. 460 can, too. The big Ford is a little more "forgiving" where getting low-end AND high-end, than the BBC. Comparing the Pontiac to small blocks, of either "brand" is a mistake. The Pontiac makes the kind of power big blocks make, especially the torque numbers. In short, what you already "know" about engines generally does not "apply". Of course, the fundementals are all the same, but the Pontiac has a unique approach to power. The ability to make massive power at low engine speed is what made GTO the "king" of muscle cars and TransAm the "king" of road cars in their respective eras. It also means a very different "mindset" is required for proper gearing, shifting, tires, etc.