Exactly, mark the cams where they pass through the limbs. You can and also measure brace height, A2A length, and the weight of the bow.It's also prudent to have someone help you and measure the actual drawlength of the bow after the new strings are shot in. Very few bows measure what they are marked. Most are longer.

Strings today do not stretch. They creep. This is the proper term for permanent elongation. So when they creep, the brace height will get lower, the A2A will become longer, the bow's peak weight will go up, and the drawlength gets longer. And yes, this can have a profound effect on the tune of the bow, andultimately the accuracy.

Do yourself a favor and opt for some of the better aftermarket strongs like Winner's Choice, Prostring, Vapor Trail or others. These are very high quality, prestretched, pretwisted, and served under pressure. They will creep about 1/8" during a 50 shot breakin (sometimes less) and after that they never move. Your bow stays the same until you replace them again a couple years down the road.