i'm sure you know the 1178 crank is a 302 forged 3" stroke crank. is there any think on the oppossite side of the block in the rear? the k 12 should be the 11th month 12th day but there should be a 7 8 or 9 after that. i'm sure you know this so let me do some checking for you to see if i can fine anything else for ya