No, it will not mess up anything, it is just one of those little details
that is nice to do when you are trying to get the most out of your engine. Most HEI's have too much play in them but they will run forever.
It is easy to adjust the end play. Just remove the gear by removing the roll pin and insert the the right thickness washer, (s). The only problem that I have run into is that the washers that you need are not standard, so finding the right size is the key. I have been able to buy thin hardened washers of the right size, but I have not seen any lately.
Jim
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