Autolite work fine in older Ford trucks. True that now you have one out and are worried. Just change them and have one less thing to stress over.For the cost of spark plugs and considering you took the time to take at least one out, replace them. And use any brand but autolite according to my mechanic.
Why do folks hate on Autolites and non-OEM plugs so much? It's a spark plug for crying out loud, not a flux capacitor.
As long as you're not using one of those gimmicky plugs like the +4, E3, etc., the aftermarket plugs should work just fine provided you use the same style as OEM (e.g. iridium, 2X plat, etc.)