Check out the code checker project that Chris Wellers started and Gavin Pickin helped work on. We used it in a large conversion to Lucee largely to identify security issues, but I think it also can check for specific tags in the code,
Also check out Pete Freitag's recent project that will scan a code base and tell you all the tags and functions you're using.
The easiest way to see if your site runs is to just try it and work through the errors. Grab CommandBox, cd to the web root, and run the "start" command to spin up an ad-hoc Lucee server and see what happens. This won't affect your ACF server at all.
Thanks!
~Brad