AFR 165 guideplate alignment

I would like to know also for my AFR185's?

Just center them as best as possible as it is normal for the roller rocker/pushrod assembly will drift slightly from side to side (unless you're running a shaft-mount system). So, you're going to want some room on either side. Once you've got the roller rocker, pushrod, and valve tip centered, (just finger tightened), then you can center the guideplate. Holding the guideplate in place with one hand, remove the roller rocker and pushrod. Then sinch the stud/guideplate down to the appropriate torque specs.