Hello guys I am new here I found this site while searching for info. I am a mechanic and a man traded me a built motor for some work and the man in his 90s said it is a 400 his son said its a 350 well I can tell for sure it is not a small block the only cast numbers are passenger side and they are 979096 or 979996 I am told that is not enough numbers but that is all that is there on the drivers side for the date stamp is 1119 all numbers are fairly clear between the date and block cast number is the letter D and N with a pointed arrow between them and the stamp of circles for the time made I have been searching for info I would really like to know what I have all info greatly appreciated and also the old man said it came out of a 1970 Pontiac Le Mans and had it rebuilt