I have the BBK full lengths on my '79 Capri, and they're the most beautifully-fitting piece on that car. The C4 does have the small converter housing, though. I hope they fit around my AOD when I attempt swapping them into my Notch!
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Capri306, Moderator, The Mustang Works Online
1979 Mercury Capri, 5.0L -- C4 -- 2.73
1987 Mustang LX Notch 