AJ's Opinion; my super-fun, 360/A-833/3.55 street-combo

Ok, I see no one has stepped in, so here goes.
Firstly; I don't know where you are going with the
VP= VE X CP x N x .3% formula.
Secondly; what are we working on here?
Thirdly; I not a fan of that 268/280/110 cam for this application; specifically, the 12* split at advertised, changes to 6* by .050. This clearly was done to make the engine idle like a cam that is one or two sizes bigger than it actually is. To me, this is a waste of extraction. See note-1.
Also;
Are you familiar with the XE268 cam?
Do you already have it?
Why do you think this is a good cam to install in your wife's car?
I see nothing wrong with what you are trying to do (use up parts); but I do question the chosen cam. IMO you can do more with less in this application.

Note -1
Leemme show you what I mean.
On paper, install that cam at split-overlap, which is in at 107*.. That will give you 119* of compression(Ica of 61*) and 107* of extraction, with 54* overlap.
Next Lets shrink that 280 exhaust duration to 274* which is about 1 cam size. Install it again at 107/ Ica of 61. The extraction now changes to 110* and overlap of 51*. The C+E changes from 226 to 229.
For a daily-driver wife's car, this is a better deal, because in steady state cruising, you can make better fuel-economy.
My open-chamber iron head max-pressure chart for (R+M)/2 gas, says this;
max for 91 is 160 and less 5psi per grade of gas; so 87 should be good for 150psi. But this is not written in stone and depends on many factors. Remember how detonation is caused.

In your situation, the engine may not reach max VE until 3500 rpm, which might be the point that detonation wants to begin..... but only at WOT and max power-timing. With 3.23s and 27" tires, this would be ~30mph. Do you see your wife downshifting into First gear at this speed.
What if you had a 3500 stall TC; the engine would never be forced to work in the detonation-prone zone.
What if you ran a special timing curve that was short of mechanical-timing in that zone?
What if you could control your engine temperature to a very small range?
What if you fed your engine fresh cold air from somewhere NOT in the engine compartment?
These are all tricks you can use to subvert detonation.
And finally, every degree of cam-timing retard is worth about 1.6psi cylinder pressure. If you already have a lot of cylinder pressure, 3degrees of retard is worth about 5psi pressure; just give it up! lol. You'll be giving it to extraction which is a good thing! for a streeter.
Finally; Breda Iowa is listed as being at 1368 above sealevel. That is gonna steal 7 psi, over sealevel.
The point being; you got a lotta options here to run more pressure while avoiding detonation.
Conversely; for this application, max-pressure may not be the best idea.