I was also thinking of using the petronix on my 57 the distrubitor is a bit hard to get to as the imp is my daily driver iI do about 2000 miles a month so the points needs atention every 6 weeks or so But my question is The distrubitor has a dual point system Mallory so the dwell angle ?? am I right english language problem is high Will this be the same with a petronix can a petronix be used with a mallory supper coil the yelow square one I used the super coil becouse my 57 is propane powerd and with this coil the starting is easyer with the standard coil I had some starting problems . Thanks Remco