Bellhousing casting numbers

[Andy]

I recently purchased an 11" bellhousing for my 67 camaro and was wondering if there were any books or websites that may have casting numbers for them. I have the book Chevrolet By the Numbers 65-69 and it does not have bellhousing casting numbers. I am familiar with the 621 bellhousing but this one does not have that as the last three numbers. I'll have to double check but I believe that 756 is the last three digits on mine.