Sud60,
You will not find those manuals on this site. Your 82 CB750 is a DOHC (dual-over-head-cam) design which is totally different than the 1969 to 1978 SOHC (single-over-head-cam) 750's. Honda changed the 750 design to the DOHC for the 1979 model year.
This site is dedicated to the earlier SOHC design. There are some folks here that also own DOHC's and they may be able to provide links to the DOHC forums and possibly the manuals you are looking for.
Good Luck.