I got a question about my chassis number in the floor...

my floor is kinda rusting away and now i got new floorpans to weld in!
Whats the best way to get the numer into the new floorpan?
Can i just go to a local Ford dealer and ask them to restamp my
chassisnumber into the new floor? or is that a stupid thing to do?
or try to weld the plate with my number into the new pan?
The bit with the number on looks all just fine