If all the linkages are free sometimes it will shear the pin off in the gov itself. If you have to take it off prosead as follows
1. Take off negitave battery cable
2. turn engine to top dead center on no. one piston
3. mark rotor pos.
4. pull dist. or mag. which ever you have
5. Dissconect Gov. linkage
6. mark gov.gears with a marker that wrights on metal
7. remove Gov.
8. dissasemble Gov. repair as needed, may just be stuck, pin sheared etc.
9. install new seal
10. JB Weld works well if there is play in linkage rod at Gov. part # 30 & 8 in Rudi 's pic
10. replace in reverse order
David