there's a date code under the valve cover that can 99% tell you what the heads are using the 4V Cylinder Head Repository 'by date'
http://www.351c.net/archive/pa...er-head-spreadsheet/
you can also use a boroscope through a spark plug hole to see if the intake valves have the Ford oval logo on them. a 1972 would've come from the factory with open chamber heads but unless you bought it yourself new there's no telling what might be on there now
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