64 belvedere 4 speed bell housing

can someone tell me the part number for the correct big block bell housing for a 1964 belvedere. it is a 10 1/2 clutch. i have most of the original parts except the bell housing which disappeared over the years.
thanks, john

any ideas at all?

Actually it should be an 11" housing.Casting # 2463019.Same for 361/383/426.

The casting number above is correct, but it is a 10.5" bellhousing. This was a one year only bell. I should have one.