I diddn't know that u could convert a 400 to a 470. I still like the 440 as my favorite Mopar because of the 6 pack ( 3 2bbls ) and the legacy that continues on between them, meaning, Most evrybody knows someone or is related to someone who has or had a 440 car. I dont think you can say that about a 400 because it was not known for it's power. The 440 was most thought after ( to the general public ) rich people got Hemi cars. Many kids know about 440's 426 Hemi's but do not know about the wedges or the other Mopars.