Jambuster1 wrote on Feb 25^th, 2013 at 1:54am:

if it is possible to use the 767-300 autopilot and fly it without using the FMC.

You just need to turn the IRS selectors on the overhead panel to NAV. Then press POS INIT button (LSK 6R on the IDENT page or press the INIT REF button) on the FMC and input the GPS coordinates into the SET IRS POS line.

Do that and you can fly the aircraft using the FL CHG (LVL CHG?), HDG SEL, and ALT HOLD autopilot modes.