Switched to HEI

I agree that 120 mil sounds like a really big spark gap. 60 mil is more typical for newer engines. But, Ford was working on a head gasket with integral "spark fingers" that would throw a spark across the whole cylinder (2000 mil?). Not sure how they would drive the spark. Advantages were a simpler engine, better lean ignition, no heat loss to a protruding plug, simpler wiring. Disadvantage was a "plug change" then required removing the head.