Big Bang After Effects: HP/MP recalc?

Simple enough question I supposed. I am working on something, and I'd like to get it started now. Let's just say, I keep talking about my plans, but I have a tendency to ignore things when I think them through too much, and know they will work out how I want, should I follow through, and end up deciding not to do it. Um... silly I know, but I would just like to know if HP/MP will be recalculated after Big Bang, for existing characters.

The plans involve a BM, I know things don't change too much for them HP/MP wise, the question is still very necessary.