“Here’s the happy marriage of a sporty car and a practical truck.”
A late ’78 ad, so we’re likely looking at the 1979 edition here. Daily 70s Ad #312: Chevy El Camino originally appeared in the November, 1978 issue of Popular Mechanics magazine.
(Source: Popular Mechanics)
Previously on Daily 70s Ad: George Harrison And The ‘Big Button’ (1976)