I have a problem with pontiac head, and big chief chev. alky injected engines ( three different ones) not starting properly or not at all, with a Magnito. vertex. and mallory super mags. compression not really that much on two of them . one 13 to 1 one 12 to one the other 15.6 to one . 112 and 114 center line cams. changed over to MSD ingnition no problem starting then. maybe somebody can put some light on this one, has anybody else had this proplem? thank you.