1.3 doesn't have an install floppy. Easiest thing to do is boot from the Workbench disk, start a shell/cli window and copy the contents of the WB disk to HD, using something like:
copy df0:#? dh0: all clone
... if I'm remembering the syntax correctly.
Then remove the floppy and reboot! It doesn't get much simpler than that :-D
*EDIT* The GVP software might include a utility to copy Workbench over, that might be the better approach if such a thing exists.