I pulled a harness from the junkyard from a 1979 f100 with a Duraspark box that has the blue plastic identifier. Bought a distributor from NAPA and a new Motorcraft Duraspark box from a different auto parts store. I got a coil that uses the horseshoe connector from NPD. then followed a guide that Viperwolf has on here. Basically plugged right up. The only difference I had was at the starter solenoid Viperwolf said use one side and it would only work on the other on mine. And use the resistor wire to the coil not a regular 12volt hot. I used the small distributor cap to keep it more 1971 looking. Works great.