The Aussies kept the Cleveland engine in production there until March of 1982, and among the mix built was a '302 Cleveland' installed in some of Ford/Australia's not-exported cars. This was a 2V head with a high compression closed combustion chamber, mechanical valvetrain and small intake/exhaust valves & passages for street use. Possible that your '73-74 block got a pair of these bolt-on iron heads at one point. They used to be quite popular until the flood of aluminum heads arrived- cheaper, 60 lbs/pr lighter & with better ports.
In the Pantera world, 'matching numbers' is interesting but means little to most. More important is how it runs.
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