It is not an easy thing to integrate or use to install OS 3.1.3 on ClassicWB, read here:
http://eab.abime.net/showthread.php?t=94493
If you are an expert, my advice is to install ClassicWB and then integrate libraries, devices, etc... of 3.1.4 manually, another work is to integrate parts of the startup-sequence omitting the specific commands used by OS 3.1.4, not easy but feasible.