Dubbing to DVCAM would be the best solution with direct DV sequence settings in FCP.
As After Effects 4:3 composition presets are 640×480 (and the optimal setting for the DC30+ card), I had forgotten over the past fifteen years that the actual frame size is 4:3 560×480.
As to the overscan, it has been explained elsewhere these frame lines do not appear on the Monitor, but they do appear in FCP, and where past captures with the DC30+ do not (Motion Jpeg A codex).
For future projects, I will work with DVCAM dubs. To finish a current project, I will still be looking for a temporary solution as to mixing new captures (overscan) with the DC30+ captures (no visible overscan) in FCP 640×480 project sequences. Maybe I will have to get the old Mac 8500 running with the DC30+ card and settle this.
Thanks! John Sykes
560×480 (420 lines): LaserDisc, Super VHS, Hi8
720×480 (520 lines): D-VHS, DVD, miniDV, Digital8, Digital Betacam (pro)