One of my favorite 69 articals is in Hot Cars...Feb 1969..
Titled... Super Stock Showdown..they road test a Byrne Bros. L-78 M-21, 4.10 and a Fairlane Cobra Jet 428 3.50 gear out of Larsen Ford. The Chevelle was Bill Barnett's personal demo..He vowed it would blow the doors off any Cobra Jet! Great artical, but may be a bit tough to find.
Steve