Hmm... That doesn't look right. Splitting words like that makes it sound like "добру" are "здорову" are actual objects you can step on.
I believe it should be two words, not four. There's some rule, I don't remember it, but I think it's the same as in "в роде - вроде", "в тайне - втайне", etc.
Spelling dictionary and gramota.ru also spell it "подобру-поздорову". I'm loosing faith in Ushakov. First "боевик", and now this.
EDIT:
Oh, ok. ) I missed this post.Да, правильно. Так сейчас пишут: Подобру-поздорову