Excellent commercial.
Each year that GM added more horsepower,they also bumped up their safety campaign.In 1970 they released a promotional film & packet based soley on this.
One clip even shows an LS-6 Chevelle with a child safety seat inside.
The color of the youtube video is pretty faded.
I have the 16mm of it showing more vivid color & clarity.
I found it interesting when they say four 396's available,
(L-35 325HP,L-34 350HP,L-78 375HP,L-89 375HP),while most other Chevrolet references consider the L-89 the same as the L-78,as it was the same horsepower.
Aluminum heads were a possible L-78 option,not a different engine.