Iso /6 hardened oil pump drive gear

When building a slant it is a good idea to verify that the oil pump drive gear is centered on the cam splines. An oil pump with excessive or too little drive gear end play will not be centered with the cam shaft splines.
What I do is after the cam is installed I brush the splines with yellow gear paste, install the oil pump with the gasket and tighten the mounting bolts enough to get the oil pump firm. Then spin the crank-cam a few times.
Then observe the yellow paste imprint on the oil pump gear. The paste transfer should be centered on the drive gear.
You cannot adjust the depth of the imprint, but it should get near to the gear tooth root. The centering of the drive gear to the cam spline can be fine tuned using the same methods used to remove-install an oil pump drive gear.
I do this check with the oil pan off, with an engine that is already built, one could remove the oil pump, use a small brush to paint the splines with yellow gear paste, re install the oil pump with gasket, spin the motor, remove the oil pump and inspect the imprint of the yellow gear paste on the gear teeth.