GM hid their paint codes in a few places in the 80's, try looking in the the center console for a sticker with a ton of #'s on it , if not there look in the left rear 1/4 trim panel with the locking flap for the sticker.
On the very bottom of sticker look for a WA# , thats the paint code!

When found I would almost bet (if its the solid red ) that it will Be this color- PPG color code #3794 (<that is not the WA# by the way)
I spray that color almost every day .....LOL
One of GM's most popular reds on all model cars.

Spray