Sounds like you’ve done your homework.

Nothing left to do but swap out the parts and see how it shakes out.

If the wot operation lands at 4800rpm, then you get an “A” for your efforts.

As a comparison...... street 505 with bowl blended RPM heads and a 6bbl....... even that mild combo made 628ft/lbs at 4800....... but peaked at 4300(645ft/lbs).

Better std port heads, single plane manifold, and a roller cam....... should have been able to push the peak up another 300rpm.

I’m not saying you won’t reach your goals for power @4800....... I’m just saying it may not have peaked yet by that rpm.