Exact year of manufacture for B18C1 engine
 

Hi Folks,
Does anyone have a listing to identify the exact year for a B18C1 engine (Head, Block and Trans.) There is usually a stamping on the head Exh. side I have seen on other H motors but the marks on the B18 Head seem not to be readable. Any other clues aside from the B18C1 stamp on the block and the sticker on the transmission??

Thanks.