I believe that the digits following the assembly plant code (in your car's case, P = Pontiac, MI) are assigned in sequence for all Pontiac's of that model year, not just 2+2's. Others will know more definitively - try asking PHS.
There are currently 20 '64 2+2's on the Registry, once one eliminates several duplicate registrations. As near as I can determine (which is not necessarily accurate because there is no way to make certain that owners register with a correct VIN) your car's serial number falls in the middle of those 20. Given that and the March production date, one could reasonably assume that it falls somewhere in the middle of the total '64 2+2 production.
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