Looking for exceptions I have Road & Track reports from 1978 and 1979 on the W72 Trans Am and L82 Vette. Both 4 speed cars and they did 0-60 in 6.5 and 6.7 seconds respectively. I assume they were honest times, because by then no one was prepping cars for magazines like they used to. For comparison I noted a Motor Trend test of an earlier editon of the C3 Vette with high comp 327 & 4 speed, that did 0-60 in 7.1 seconds. So I would rate the Corvette engineers that got the L82 1979 Vette to do that well on 91 octane unleaded as very good.
That said, most people rode around in L78 automatic T/As and L48 automatic Vettes, and they were only high 16s cars at best, so that sucked and you can see why imports were on the rise. The 1979 BMW 528i 4 speed only had a 2.8 liter motor but did 0-60 in 8.2 seocnds and 125 mph with those huge 5 mph bumpers. Car and Driver got the same acceleration time so I assume that was legit. But it wasn't a cheap car. I did read a report on a special Grand Am Coupe Pontiac were working on for 1979, with a 170 hp 301 with ESC, that was a 4 speed car that got 0-60 in 8.2 seconds, but it wasn't put in production. It also had great handling with the equivalent of T/A WS6 suspension and 4 wheel disc brakes, and rear drive of course. Shame they never built it.
0-60 mph in 11 seconds wasn't bad for a minitruck!!