G0704 CNC mill spindle rebuild.

If you have vee blocks, can you roll it on the front bearing race to get a runout reading of the taper?
 
I got the Nachi bearings tonight in the mail box. Now, do I need to shim the Nachi bearings like we did the AC bearings that are much thinner than stock tapper bearings? I have the shim washers from the AC bearings and just need to know if they need to be shimmed to preload them? As always help is greatly appreciate. It looks like the new spindle is the same dimensions as the older spindle just better machined.
thanks for looking
CH
 
Never mind found a post on another forum, these are direct factory replacements. LOL HSM.
CH
 
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