Look for the broadcast or build sheet. I have found them on top of the glove box, under the front or rear seats, under the carpet and believe it or not, on top pf the fuel tanks. I have also many times found more than one on a car. The problem with 56 year old cars, much have been changed through out the years. Motors are most popular in a change. Example: I just found a 67 Coronet that has a 440 six-pac in it now, but came with the 383 2 bbl. BDW, I have VH41, as a 4 door sedan and a Valiant 200 or Signet. The H1Q as red.