Yeah Thanassis! Kind'a raspy, mixed with that straight-cut gear "hissing/shhhh" sound!
There's a fellow by the name of Yoshi Kosaka who has owned and operated one of more notable restoration/custom shops around SoCal for many years now...
http://garagecompany.com...and he often rides his beauty of an MV America to vintage rallies. And whenever he's riding in, you know it's him without even lookin' up, as there's nothin' as sweet and distinctive a sound as those old MVs.
(BTW...great story there!)