To find the correct gap, you need to:
1. Locate your owner's manual: This is the best source for this information.
2. Check under the hood: Look for a sticker on the distributor or other ignition components. This often provides specifications, including point gap.
3. Consult a Ford parts manual for 1968 F600: A parts manual specific to the year and model should list the correct point gap for the various ignition systems used.
Without that specific information, providing a point gap would be inaccurate and could damage the ignition system.