1965 Bathtub top or 1970 ?

Can someone verify the date associated with casting number on this Hemi bathtub intake -#2531631 ?

I'm thinking 1965 or 1969/1970.

Thanks.

[image]http://img148.imageshack.us/i/sdc10040.jpg/[/image]

[image]http://img148.imageshack.us/i/sdc10039r.jpg/[/image]

[image]http://img148.imageshack.us/i/sdc10038.jpg/[/image]

[image]http://img148.imageshack.us/i/sdc10037c.jpg/[/image]

25 is usually a 1964 or 1965 part number.