It's definitely worth testing first, particularly if it is a Series II (soft focus) lens. Below about f/8, the Series II should behave pretty much like any other lens of similar vintage, but near wide open you will probably want to increase development time a bit (all that scattered light has to go somewhere, and some of it acts to decrease contrast). Also, sharp transitions of light-to-dark will look different in soft focus. It's something of an acquired taste.
I think, but am not sure, that the Series II Velostigmats were marked with focal lengths in inches, not millimeters, so you may have one of the other, more conventional, series.