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This is very, very simple. I did this as well as I had grooves in my strike plates on my old head. Made a ton of noise (sounded like rod knock almost). I replaced these and it made a world of difference.
If you have the factory HLAs (as mentioned), you do not need to reshim. DO NOT TAKE THE SHIMS OUT. You don't want to mismatch the shims that are currently in there or you could have an issue. I do, however, recommend you take the extra 10 - 20 minutes and bleed the HLAs with clean oil. It will get the old gunk out and help prevent any sticking.
I have a BNIB set of rocker arms for sale if you're interested. Just let me know.
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