Do you have the original paint code? I'm not familiar with the early years but if you do have it, just go to your local body shop supply store and see if they can mix it up for you.
Paint colors can be mixed by just about anyone "IF" you have the paint code and "IF" they have a formula.
Check out
Old Truck Paint help on oldgmctrucks dot com Don't get hung on brands, the're all mostly good.
