I worked for a Buick Dealer and had Regals as my company cars every year. 1980 was the last year for a "decent" V8 (Pontiac 301, which is pushing the term "decent). After that, the only choices were the lame 265 Pontiac V8 and eventually the 252 Buick V6. I'd just order a 231 and get the 3.23 gears, which weren't an option on the larger motors. My little 231 was faster than either one of the choices.
Come 1983, we acquired a GMC franchise, so my ride of choice became a Caballero with a 5.0 and 3.23's.
Obviously, I went back to Buick in 1986 for a GN and stayed there for a couple years.
For the most part, the 80's were a true disaster for any kind of OEM performance.
Bill