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All 1965/72 V8 engines installed in F100/350's came from the factory with 2V carburetors. 4V's were not an option until 1975, and then only in F100/350's with 390's (VIN engine code M).
since your question what how do i tell the fastest way is to grab a stepstool pop the air cover off and count the barrels 2v is two barrel 4v is four barrels as was mentioned a few posts up