I also have a set of 427 emblems with the crossed flags...but the flags are smaller and these smaller versions ( I believe ) went on the front fender of a 1966 corvette.
....I pick up my 1966 Belair "post car" tomorrow from the upholstery shop....new "Cameo Beige" paint and new "Fawn" vinyl interior...new dual snorkel air cleaner with a big block and 4 speed, F41 suspension, power disc brakes and power steering.....YeeeeHaaaaawww!