Once you use 30 taper, you would not want to go back to R8, tools are much easier to change, and there is no dog point screw to shear off and 30 has a positive drive with 2 keys. Both of my mills have 30 taper, my B&S mill has a universal angle head that took 30 taper camlock tooling, I bored out the spindle to accept a drawbar and milled the spindle end for the keys, my Fray mill came with the 30 taper spindle, so I can use the same tooling for both; I picked up the tooling on e bay mostly, pretty much on the cheap, as it seems not much used generally.