How many different castings were used for the 1970 440 HP engines? Looking at casting 2951736, mine has no date code on the top showing, just see a 11x11 on the bottom. Is this the date code as in 11 month 11 day? Would be interested in seeing pictures of original intakes on Superbirds as that is what mine is off of. I was looking for a duplicate of mine for a project and didn't realize how many different ones apparently were used.

Thanks!