Volvo's boxy look first appeared for the 1967 model year with the introduction of the 140 series. In 1968 I bought a new Volvo 142 while I was a starving graduate student at Penn. Two grad school buddies also bought 1968 Volvos -- one a 142, another the older 122 series model. We each experienced mechanical problems. One friend's 142 came close to catching fire on one occasion, and my other friend's 122 had to have its engine either rebuilt or replaced (I forget which). My car suffered from a faulty Bosch distributor, small beer compared to the others' problems.
I could afford a new Volvo in those days because they were far less posh than today's versions. For example, instead of floor carpeting, my car came with rubber floor matting. Air conditioning was either not standard or unavailable, so I didn't have that. My car didn't have an automatic transmission, instead having a long, long gear shift lever sprouting from the floor. Nor were there all the emissions and safety gizmos mandated for today's cars.
Volvo 140 series car featured uncluttered, simple shaping that didn't look heavy thanks to their tall greenhouse area. Unspectacular, and (aside from a problem noted below) pleasantly styled.