The timing hole you're looking for is the one above the starter. Most of the time, the marks on the flywheel are hard to see- - - -possibly covered with oil or dirt. I'd suggest taking the sheet metal cover off the bottom of the bellhousing and cleaning the front surface of the flywheel, then put a drop of white paint on the ball that's imbedded in the flywheel.
Turn the engine by hand until the ball aligns with the pointer that's visible in the hole above the starter, then loosen the clamp that holds the distributor to the vacuum advance assembly. Turn the distributor housing clockwise until the points close, then back it up CCW until they're barely open. This should get the timing close enough to start. Thye ball appears twice, once when the #1 cylinder is on compression, and again when #6 is compressing. As long as the ball is aligned with the pointer, the timing can be set on either cylinder. Just be sure the plug wires are correct, so the rotor is pointing toward the cylinder that's on compression. The firing order is 1-5-3-6-2-4 with the distributor turning clockwise. Have you tried squirting a little oil into the spark plug holes? If the piston rings aren't sealing well, the engine might not have enough compression to start. Don't overdo it- - -you could oil-foul the plugs.
Jerry
