Here is the diagram for the 460 engine. I think the 400 is different.
The actual firing order should be stamped on the intake manifold.
This photo has an extra 6 in the firing order - the correct order is
1-5-4-2-6-3-7-8
SOURCE: 1977 Ford F_100 wiring diagram
http://www.ford-trucks.com/article/search.php?query=1977+ford+f_100+wiring+diagram&submit=Go
The link should provide you with a lot of useful info the truck is well just cool. ;)
SOURCE: How do I change the spark plugs
You have to take the engine cover off, and then you should see the spark plugs on both sides of the engine. If you can't seem to find them, just follow the wires from the coil or distributor.
SOURCE: Need diagram for spark plug wiring for 1997 Chevy
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