I have the same enlarger. For switching from 35mm to 4x5, LPL recommends changing out the diffusion box. Exposure times can get long when using the 4x5 box for 35mm.
VC filter are not required for the VCCE head, the upper window is the scale for Kodak Polycontrast III / Polymax III and the lower window is Ilford Multigrade IV and compatible papers. Took me forever to find that little tidbit of info.
Enjoy as it is a great enlarger.