kocyba51....welcome. I read your post as a question on where the timing "hole" is. You will see it in the bellhousing if you look above the starter. If you go under the truck and remove the cover on the bottom of the bellhousing you can rotate the engine till you find the ball that is set in the flywheel (some flywheels have a triangle shaped mark instead of a ball). Clean it and put a touch of white paint on it. Also put a touch of white paint on the pointer in the "hole". When timing the engine this paint will make seeing the timing marks a breeze when the timing light is flashing.
Then follow the directions waldo53 gave above.
Good luck with the truck and welcome to the 'bolt.

Carl


'58 3600 350/4-sp/stepside/big window cab
'59 3100 235/4-sp/stepside