If it's a proper professional quality 2pac paint job $400 sounds like a bargain!
My tank had several dents and a little rust hole in the bottom, but my sidecovers are brand new old stock OEM. So far with dents pulled, tank sandblasted, hole repaired, tank sealer professionally applied(-$400 just for that!) and 2pac undercoat done so now it's ready for colour, it has come to $1200. Estimated total including repainting the fuel flap and the black part of the tank badges is $1500.
If I had given him a tank that needed no repairs and picked a non metal flake colour it would have been around $300 for a tank and two sidecovers!
John