Ball joints!

[FrankenTruckSS]

Hey, my truck is registered as a 74 c10, because thats what it has for a frame, but it was converted to 4x4 at some point in its life and the 350 was swapped for a 305 H.O. out of a monte carlo SS. I need to replace the ball joints and have no idea what to get because i dont know if that was changed when it was converted to 4x4 or not. Only the front ones are gone, and i was hoping to have them fixed by the end of next week. Thanks in advance for your help.