Ignition system problem? Help!

cosworth said

Car is a 1974 Duster 318 M4. Previous owner hacked the engine harness up I got a replacement from Waggs. I will try both of these suggestions.

At this point if somebody said standing on my head while rubbing my belly would do the trick I would give it a shot.

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Chk the connector between the distributor and the harness.
I have seen heat cause intermittant connection there, and removed that plug from my system because it drove me nuts till I found that's what it was.

I went with fuel because you said you had to feather it to keep it running.
Could there possibly be another inline filter under the car somewhere?