The 300 straight six Ford is a low end torque engine, just like the 258. The reason, at least as I see it, that Ford speced out the better parts in basically the same year rigs is that the more powerful coil and wider gap can fire a leaner fuel mixture without misfiring, as compared with the old school cap, rotor and coil. The spark plug style terminals on the cap and coil seal much better against moisture, also. The 8mm silicone jacketed Ford wires generally last longer than the 7mm neoprene jacketed AMC/Jeep originals. At your local parts store, these parts cost about the same, or less, with generally better availability than the OEM style parts. I've changed out a few Jeeps, older Fords and AMC's to these parts with very good results.