302 head question

there is also a number 4 cast on it too just like your number 5 and the J is the same in size and location. So from what everyone is saying, IF I understand it correctly, the casting number is definetly 302 so that is what I must have. I tape measured the intake valve, I know not very accurate but the best I can do right now, it is right at 1-3/4".

Thank you.