In what way? Value, nope. Handling, my 70 out handles my 88.
If your '70 Cutlass out handles your '88, you are doing it wrong. I'm not talking stock (but even stock a performance G-body would easily out handle even a "performance" '70 Cutlass). With simple, cheap mods on G-body, no '70 cutlass would be able to touch it (unless the cutlass had Cubic money in suspension mods) I'm trying to remember the last time I saw somebody trying to drive a near stock suspension A-body at a driving event and I can't think of one. Sure my memory is great, but I'm drawing a blank.
I did a full suspension on my '72 Chevelle with heavy duty springs and 1.6" and 1.4" sway bars and it rode and drove nice, but it couldn't out handle my T-type. The A-bodies are the nicest riding/driving of the "classic" muscle cars, but if I was building a pre-1988 car to autocross, it would be way down on the list of choices, even below "mustang II".
Malibu's and El Caminos are not "rare performance models" and the prices are already climbing for nice ones. This is the first year for G-bodies at GG's and NSRA. People soon will be ditching their pre '72 rust bucket projects in favor of something more modern, with factory air, power disc brakes, etc that requires less work to finish.