If you have aluminum timing belt covers you have the old 3.2L. If they're plastic covers then you have the newer 3.2L similar to our engine.
This vid I have explains the similarities and differences between the new 3.2L and 3.5L and how these engines function.
9:31, 320x240, 16.3 MB, WMV file-
http://www.drivehq.com/file/df.aspx/publish/mgpa/techvids/engine.wmv
Mark