it is my understanding that the modern upgrade is good for msd and hei but if you have a 1970 1 year only 1 wire tac it will.be gutted and will no longer work on points. For this reason I would use the 2 wire tac and save my original one but that's me. once you go modern points will no longer work. I.dont understand why it doesn't and all I know is not to.modernize my 70 tac but good news is 1 can run a petronix with no problem and keep it number matching or points. I'm not building a race car just restoring my 1 st car. if my info is incorrect please correct me
just trying to.help
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