All inline styles in RH
are not "just called 'Body'." Those might be the assignments
made by the previous writer(s), but you're in for a ton of work,
I'm afraid. It sounds like they assigned font attributes to
specific pieces of text, while not changing the style from the
default Body, thereby producing pseudo-H1's.
You'll need to strip the SPAN tags (which will contain the
styling junk) and then actually assign the Heading 1 style to the
content.
Good luck,
Leon