Does the base circle take up approximately 180 degrees of the lower portion of the cam?
I'm not sure on the 750, but on the 550 it does not. It makes up less than 180. It's not always obvious from documented duration figures either. Kawasaki specs duration at .012" if I recall, so it depends on the lead-in and lead-out ramps.
(Because of this, you cannot measure the base circle diameter directly with a caliper. You have to mount it and rotate it and measure with an indicator, then use a caliper to get the full heel-toe distance to compare against.)