Help with casting and part number

[Trueoo7]

I have a 302 block, casting number F1SEBB with the number 10 overtop of it.
There is nothing under the starter. Can anyone tell me what this is out of. Also if this helps the part number on the oil dipstick is F1ZE-6750-DA M.
I cannot find a replacement dipstick that will fit. Old one is leaking. I tried buying one with a part number E7SE-6750-BA M
but it will not fit. Its close but no cigar.

Thanks

[Woodz428]

The F1 would indicate a '91 and the S following it is for a T-bird. It may be the same in other vehicles, but was originally cast for the 'bird. The dipsyick has a Z for the mustang. These are letters for their original intent and are used in other models as well.