1 ton dually

[72chevfan]

I have recently became the proud owner of a 1972 C-30 1-ton Chevy flatbed truck. It appears that it left the factory as a non-dually truck and someone retro fitted it to a dually. The problem is that the front wheels are not a match to the rear and it appears that I will need to change the front rotors to accomodate using the dually type wheel similar to that found on the rear end. Can anyone provide the details of what this entails? On a second thought depending on the cost of the conversion parts I have entertained converting the truck to 4x4, using a later model Dana 60 in the front end. What years are the best for this type of conversion to get the correct springs, mounting hardware and steering box? Thanks for any tips.