I have a set of those, not on the car yet. I shot brake cleaner down the shafts and blew them out thoroughly. Found a couple of the oil ports on the rockers were semi-plugged with crud and I didn't like how the adjuster threads felt. Completely dis-assembled and ran a tap through each one then took a paper clip and cleared out all the oil passages in the rockers and blew them out with compressed air. A few minutes in an ultrasonic tank would be ideal, so I did that too. Made sure all the rollers were free, assembled adjusters, and soaked in oil. Assembled onto the oiled shafts and set aside for install at a later date. Can't help with the shims other than to suggest reading one of the rebuild books or factory manual for clearances.