If you want to transfer it you have to follow the same regs in regard to markings as any other manufacturer. That means a unique serial number, your name, city and state, and caliber of the rifle. Minimum height and depth of the markings apply.
If it remains with you, the trunnion number from the original kit would seem to be enough of a serial number for reporting stolen or whatever. Imported Aks have their serial # there, only US made receivers are serialed on the shell.