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I recommend just finding a hinge on a salvage yard truck and replace the whole thing; 61-66 model.
Mitch, 1961/63 door hinges are different. There are two types for 1964, early and late.
The late 1964 hinges are the same as 1965/66. Since the OP has a 1964:
1964 F100/1100 before serial number 490,001:
C4TZ-8122800-A .. Right Upper & Right Lower Door Hinge-Reverse Hinge Pin to use for Left Upper & Lower / Obsolete ------------------------------------------------------------------------------------------------------------------------------- 1964 F100/1100 from serial number 490,001 & 1965/66 F100/1100:
C4TZ-8122800-A .. Right Lower Door Hinge-Reverse Hinge Pin to use for Left Lower / Obsolete
C4TZ-8122800-B .. Right Upper Door Hinge-Includes Check / Obsolete
C4TZ-8122801-B .. Left Upper Door Hinge-Includes Check / Obsolete
If the door is opened while the truck is parked on a slope, the check prevents the door from swinging closed by itself.
btw ~ 1964/66 F100/1100: Ford did not sell the hinge pin, the entire hinge had to be replaced.