No need to remove any covers to change oil.
Just drain and fill.
If you are cleaning out the filter, there are gaskets on ebay for $12,
http://www.ebay.com/itm/HONDA-CB360T-CL360-CJ360-CB-CL-CJ-360-RIGHT-CRANKCASE-COVER-GASKET-11394-369-306-/391452842479?hash=item5b246859ef:g:j7MAAOSwI3RW8e4r&vxp=mtr