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Your timing cover looks right...thanks for the picture...
One other thing that hasn't been mentioned..
I've read that the bakelite/plastic distributor upper body can short internally between the traces to #3 and #4 cylinder's spark plug posts causing a miss-fire.
Here is a thread where it is mentioned..
https://www.fordbarn.com/forum/showt...39#post1768839
You might try swapping out the distributor upper body if you have a spare...
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