background: Dead battery, charged it up, cranked engine would not start.
Checked the pertronix cranking between 0 and 12 volts, okay
Must be coil: replaced. car started once then would not start
Replaced part of pertronix, would not start
Removed the tach wire and car fired up and runs as it did, checked for back feed of 12 volts, nothing.

What would be the most logical next step?

thanks,
rusty