jeffko Itbites has it right for the chevys. I used the same thing for my first motor in my car. I am running a 100 psi spring for the
oil pump. Harded shaft for the drive. This is oiled by splash and drain off coming from the
oil valley. If you slot the lower housing on the distributor so the
oil drips on the meeting spot of the 2 gears, this helps to lube this location better. Cuts the wear, heating, and helps better lube the spot. If you want to get fancy, run a line to the location with air craft line and a very small oriface to spray the oil on the gears. This is an old racer trick. Rick Lake