EPUB -> MOBI -> HTMLz margin/blockquote annoyance

When I convert retail EPUBs to MOBI and then to HTMLZ, if the EPUB had 'quoted' blocks of text that was in <p> tags with a class that is indented from the normal body say 2em both left and right, it ends up after the conversion in <blockquote> tags, (sometimes nested multiples), but the margins get screwed, the left margin gets indented, but the right margin always ends up with zero indent, so the quoted block is pushed to the right and not centered like it was in the original with indents on both sides.

Why is that, and can the conversion not simply retain the original left and right indents and leave the text in a paragraph tag like it was?

Thanks
The REAL Joe