I think it is great to give the customer some options with respect to their restoration. If someone wants a nicely restored carb for a vintage clone/street machine then the little differences probably don't matter. if you are going for the "anal, down to the last nut and bolt resto/trailer queen" then don't spare the money..do it right. Ultimately it is up to the customer to decide what he wants after discussing the options with you. As for ink stamps, they are certainly a nice touch to any carb resto. If a customer wants this "option" then I would have them tell you what they need specifically. I am sure you can provide the stamping choices and do them correctly...but you shouldn't have to swear on a stack of bibles that a certain font, was used on a certain part and be held liable for some judge's review. The process should be a shared one between you and the customer. Our hobby should be about exchanging info, ideas and being helpful to your fellow car nut. The more we work together the better everyone's car will be....
wilma