I've figure out (with casting numbers) that my 454 is a factory high performance passenger car block from 1971. The heads are 1969/1970 427 open chamber, oval port, 101cc heads. The numbers stamped on the left front of the block tell what car they came out of, does anyone know how to disipher those numbers?

here we go hot rod by reading the numbers and the info that has been given to us and since everyone else is at the fockin lake on the nicest day so far this year, i will do my best to give you what you want the vehicle it came out of was a  CHEVROLET for any other help please be free to ask and i hope this will help you out      LOL    your welcome