Hello rcasdorph,
Along with the suggestion by p.sim, We would suggest you to use the Code Analyzer to check the custom codes http://help.adobe.com/en_US/ColdFusion/10.0/Developing/WSc3ff6d0ea7785 9461172e0811cbec0d04c-7fee.html , before you migrate your application. The architecture of ColdFusion changed from JRun(till ColdFusion 9) to Tomcat (ColdFusion 10). Thus, there are possibly many codes changes from ColdFusion 7/8 to ColdFusion 10.
Regards,
Anit Kumar
