My gut feeling (knowing how my boat is built) is that it will NOT sink.
It could turn turtle, but I doubt seriously that it would sink due to the under deck flotation, and trapped air pockets that would certainly be in the hull.
That said... comparing a Parker to a Whaler is really an apples to oranges comparison.
You have two totally different designs going on here.
Whalers rely on the foam in the hull as a structural element, and foam isn't going to sink.
Will the Whaler remain upright? I have my doubts... but who knows?
Anybody want to test the theory...?
Will the boat sink? I don't thinks so, but I don't believe the Parker will sink either.
So what do we take from this discussion?
Be prepared... have your emergency equipment in place... and make sure that your crew knows the SHTF plan.
Preparedness is key (IMHO).