No meter is "calibrated" for the sohc however it really doesnt need to be. In the manual you will find a min/max dwell. the longer the dwell, the more the coils can potentially charge. Make sure the points are in good shape and gapped ok, from there, fire the bike up and run it a bit to warm it up some and hook things up according to the booklet.
I would probably keep it slightly under the max.