who can decode a 318 engine stamp number?

F=1970 W= Windsor plant 318=disp R=regular fuel
missing # between 30 & 6=date engine built, julian date
0379=unit built that day
10 23 9= casting date Oct 23 69
2586030= casting # 318=disp 2= casting master change, 2nd change
This is the way I was told a long time ago