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... casting number is 5751204, which doesn't seem to fit the typical Ford numbering scheme ("C" prefix, etc.)
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That CASTING ID NO is correct as FORD used a seven digit PN system briefly from 1958 to approx 1960.
You want an exact match regarding the heat riser valve as if you change the manifold outlet design, you will most likely have to have the exhaust inlet pipe redone.
1961 MERC 352 2V?