If only .008" was removed from the head and you are running an otherwise stock motor with stock cam, you most likely don't need the extra valve to piston clearance provided by a thicker head gasket and therefore you should get a standard gasket. This isn't a gasser motor with a combustion pocket built in the head that has decreased from milling the head, because the head is flat, all you've changed is the valve depth or distance from the valve faces to the pistons and usually there is plenty of valve to piston clearance on stock trucks to where losing .008" will not hurt anything. As far as compression, you'll lose around 0.40 cc's from the valve pockets if the valves are not reworked and set back deeper into the head, this will raise the stock compression from 17.5:1 to 17.6:1 or not enough to worry about.
However, if you decide to go with a .010" oversized head gasket, you'll drop the compression from 17.5:1 to 16.89:1. If you don't adjust the valve depth and factor in the decreased volume, you'd end up near 16.99:1.
Either scenario will we just fine for a stock truck; I'd personally go with the stock gasket and slightly higher compression if it's a daily driver 400 HP or less type truck because higher compression will net better fuel economy, faster turbo spoolup, and easier cold weather starting.
