Engine stalls when you pull number 5 spark plug wire.

Bewy said

Yup, #5 is doing all the work. What heat range spark plugs? Check the resistance of the spark plug leads.

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Champion RC12Yc. I checked the resistance numerous times. Also used a new set of MSD wires including new cap. Same results.

Bewy said

Also check INSIDE the dist cap...& rotor....for arcing.

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Only thing I saw is that the reluctor gap was too big. The pick up plate in those firecore/summit distributors really sucks. It is kind of loose and ensures that the distance is not the same between the top and bottom of the pick-up, making it difficult to adjust the distance.