Welcome to the 'Bolt Barnwood Man.
Juniper Green was the standard color, but there were 11 other colors available as options. Any of them would be "factory correct", but the green you see on yours is probably the original. The big bolt bodies were monotone (two tone was only available on the 3100-3800 series), but there may have been some striping schemes.
The grill outer bars are body color, while the grill inner bars are Thistle Gray, unless the body color is Commercial Red or Pure White. Front bumper is Anvil Gray. I think the wheels were Anvil Gray also, but I'm not positive about that. The word "Chevrolet" on the grill is lettered in Waldorf White. I'm not sure if the running boards were body color or not.
There have been questions in other threads about interior paint colors, but there seems to be some confusion here and I'm not sure anybody has a definitive answer on that.
