It's just a manifold, not the whole CJ package. The Bullitt & Mach 1 had the GT350 intake, so I don't see why it couldn't be done. Looks like it has different cams though, so intake might not be part of the package.
I expect it to be over 480, because the 480 level was already reached, and for them to say new power level approaching 500hp would imply more than the previous 480.
The bigger question is, will the new 2024 Engine be a 5.0, 5.2, or 5.4 displacement? Quickest way to up the power is to up the cubes. And with the dual intake coming, it may be larger this time.