Audio and Video Slowly Drift out of Sync

Ok so I'm hoping someone can help us out here.
So we have a video that was recorded 20 years ago on VHS tape. We captured that footage using a converter into FCP 7 using the DV-NTSC Capture preset with 48khz for audio.
The sound on that tape is awful and thankfully, we had a cassette tape that recorded all the audio. We used another converter to record that into pro-tools and bounced it out of pro tools using 48khz preset. Its currently a AIFF file.
Once we brought the two together in FInal Cut Pro, it starts off in sync but slowly drifts out about half way though. Any idea?

Find two sync points - one near the beginning and one near the end - maybe a syllable of speech, where you can see the mouth movements?
Put separate markers on your video and audio at all four points. Adjust the speed of the audio until the markers align.
You can calculate the new speed you need if you measure the lengths on the timeline accurately, and get the markers to match within a frame - plenty good enough over the whole timeline.

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Audio and Video Slowly Drift out of Sync

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