the casting number is found on the under side of the intake ports. they will be something like C9OE, D0VE, E7TE, E8JE. (Those numbers are just examples. the D0VE are big block heads)
__________________
Governments are instituted among Men, deriving their just powers from the consent of the governed, — That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it