The easiest way to find the paint color is to check the manual out over on Tamiya club. Really though, that body looks great and you might end up screwing it up stripping it.
The Avante is a great looking buggy but I didn't care for it as a runner. I have had a few avante's in the past. I found a shop that had almost every spare part. I bought all of it. I kept one set for myself and sold off the extras for a healthy profit which enabled me to buy every single Tamiya hop up part for the Avante. Once I had all the parts I decided to sell off this one that I had restored. I painted it up with some Allclad chrome paint.
Then one day I saw the Knight hauler video and I sold everything off which enabled me to buy a full option Knight hauler, a Tank trailer and aluminum wheels all around