Kodak BW400CN is really intended for commercial processing where the orange mask is approximately the same as for color negative films. This makes it easy for the commercial printers using color paper but is a PITA for home enlarging. Since you will be using BW papers there is no need to compensate for the orange mask. However, exposure times will be much longer than for ordinary BW negatives. Because of the mask you will have a problem with VC papers, I would suggest using a graded paper.