[Conor Flynn] "Does anyone have a suggestion for how to sync the footage and keep it in sync? "
As jerry suggested you need to merge the audio and video, but he left out one very important point-
you ALSO need to convert the audio to 48K Aiff files. DO NOT use wav. inside of FCP files for this , they require extra CPU processing and that is likely the issue causing the drift, since the audio files as WAV's need as to be processed separately each and every time they are played back.
gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD