just a point a v5 is not needed to register as scraped this can be done from a vin/chassis no.
to be on the safe side you can remove the numbers
as for engines i dont think v5 can be used to proove age as the old trick was to register your rotting doner to have any old engine no. then use the new v5 to register your kit.
if its a ford motor its easy to get a letter from ford (free) or some iva people are happy to go from a ford dating chart (look in burton power catalouge)
or fit a cat
