I put a Pertronics in my 72 F250 360 when they came out years ago. It is still in there and all I do is change the cap and rotor about every 2 years. I now use them in all my pre-eletronic ignition Fords. I also get the coil they reccomend and paint the top yellow so it looks close to the original coil. I think getting the matching coil makes it work even better. Just my .02 worth.