What emblems are you doing this to.......The stock ones on your '04??
Do you want it to look like an Impala?? Where the entire emblem is color matched to the truck???
What I think would be cool, is painting the black white, and leaving the chrome. Paint the whole thing, then when the paint is tacky, use a q-tip with acetone to get the paint off the chrome. Well.....don't know if this'll work due to aceton eating up plastic....but it;s worth a shot with you emblems on you r truck now.