I got a 12 valve Cummins, and Eaton 5 speed out of rusted out medium duty Ford. I see plenty of 67-79 Medium Duty Fords for sale at attractive prices. How much of a headache would such a swap be for someone with moderate Fabrication skills? Should I just look for a decent 80-99 truck to swap these parts into instead, since there's already factory set ups for this? Thanks for any help.