In your particular case---turn over the shafts----set adjusting screws in the middle of the range from full up with cup against the bottom of the rocker to a down adjustment that leaves a full nut on the lock nut-----measure with your adjustable rod---see if that will work on all 16 or whether you'll need 8 and 8 for intake and exhaust, etc------at this point you can look to see where the wear marks are on your valve tips--should be fairly small and centered in the middle------