The bell housing part number in my '69 383 RR is #2892626 (11" cast iron). This is a one year part number and was used for 383, 440 B body cars. Not sure if the 440/6 or hemi used a different bell housing or not.

1968 part number for the B/RB 11" cast iron BH was, #2892262.

If I remember correctly, these two bell housings are identical except for the part number.