hi ndp_2010
not sure if you know about graflex.org but there is a wealth of information about all things graphc/graflex there.
i hope this helps :
http://graflex.org/speed-graphic/kalart-adjustment.html
explains exactly how to adjust your rangefinder for the lens you you have. it seems that whoever owned it before you
must have used it with a longer lens ...
with your camera, i think there is 1 cam, so you adjust the rangefinder for 1 lens.
if you have other lenses ... you can use your bed's focus gauge and guestimate focus with that
and fine focus with your ground glass ... some people have a handful of infinity stops, they
know which ones to lock-up for whichever lens they are using ( as long as they are set for infinity with whatever lens they have on the camera
good luck !
john