It's off a 61-63. The 3 bolt bumper bracket was used 3 years. Ford generally just stamped the date of introduction or change, not a date of production. Looks like a heavy truck, as the F100 didn't have that many leafs.
Make sure it doesn't have the double brake cylinders - you can't get parts for those. You can put disks on it fairly cheap if you can make a bracket.
Ok, I'm just throwing out useless knowledge in my head - just feels good to use it.
Just about a book on 48-60 truck front end options here: http://www.ford-trucks.com/article/idx/10/0/ Most of it probably won't interest you as it deals more with MII replacement type stuff. But it also goes into steering boxes and such.
I used an ECI(http://ecihotrodbrakes.com/early_ford_discbrake_conversions.html) basic kit on my 63 and grabbed the rotors, calipers, etc. from junkers or bought new - total cost was about 250$ (with new master). I no longer have to stop using the brake and pray method.
The 52 axle is different, but I think it's basically the same kit - I don't know if the bracket is different or the bearings/rotors/etc.