Andrew,
If you are using Algor Simulation 2011, you can go to the "Tools > Options" menu. The "View Options" tab lets you choose the definition of "Front" and "Top". There are also pre-defined templates, so you can simply choose the template for Inventor.
P.S. This feature is new to 2011.
John Holtz
Product Design Engineer, Algor Simulation
Autodesk, Inc.
John Holtz, P.E. Global Product Support
Autodesk, Inc. If not provided already, be sure to indicate the version of Inventor Nastran you are using!"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉