Go back to basics first. Check all leads are properly secure - all HT leads, coil + and - Ignition amplifier plug.
Pull the king lead and then crank it over - is there a spark? If no check connections to coil and ignition amplifier. If yes, then pull a plug lead and see if you get a spark - if no then rotor arm.
If you have sparks in the right places, then check connection on coil Neg - you might be losing your fuel injection trigger pulse.
The other thing to try, assuming you have sparks and fuel is slacken dizzy clamp and advance it up a bit while somebody cranks the engine over, have had to do this a few times over the years but it works. then check ignition timing.
If you go in to the V8 section and do a search there is lots of info about non-starting issues and rough running. HTH