Ditto on what Tomguy said. I would check and clean the fuel pump contacts under the car first. Also check the lead from the master relay to the battery. If the battery terminal is corroded, master relay (and the ECU) may not get proper voltage and cause problems. I would get a spare fuel relay no matter what for testing because it is the same as the master relay.

And check whether the ignition coil leads are corroded/loose. If nothing works, it is more than just an ignition misfire, which means coil leads broken, distributor rotor failure (unlikely) or your points broken/not opening/not sparking.

Intermittent failures are the worst to diagnose, but usually are electrical related.

Good luck,

Bert

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'70 111 280SE/c 3.5 (4 spd manual) - sold
'63 MGB
'73 MGBGT V8