yeah, you need to measure for the correct length. typically you want the rocker tip to start on the closer half of the valve tip and than as it is pushed down it should roll across the tip away from the rocker and than back as it comes back up. you can check it by coloring the tip of the valve with a sharpie and than turning the motor over with the rockers installed properly. you are shooting for the middle third of the valve tip to have the sharpie rubbed off.
now according to the picture you do need shorter pushrods as that will lower the height of you rocker which will pull the tip back closer to the backside of the valve...if that makes any sense
It appears the pushrod is a tad to long, the pattern like you posted on the valve tip should not be any larger then .080". Mark the valve tip with a sharpy, adjust the rocker and turn the motor over.
the rocker should roll across the tip, make sure it does slide, and it should move towards the exh then towards the intake.
I personally do not trust those Proform Rockers, many have broken....
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