"on the radiator support B0 25730 on the cowl B3 564300"
Quoted from earlier post. The B0 25730 is missing one number, but B0 is for a car with a 0B VIN, or 1970 Hamtramck plant. If you can see what the missing digit is I may be able to tell you if the radiator support is from a Challenger or Barracuda.
Same deal for B3 564300, it would be from a 1973 model built at Hamtramck, and the VIN of the original car would have ended in 3B564300.
Barry