I think they are a little confused?
Looks like a 440 to me.
1970 PLYMOUTH BARRACUDA, PLYMOUTH: 1970 Barracuda Hemi 440-6, Numbers matching, shaker hood, automatic, performance axle package, rotisserie restored, highly detailed undercarriage, plum crazy purple, with black interior, This car is the real deal! $125,000, negotiable. 330-606-0511