Please help to select the right stuff, Distributor, wires...

Achill said

the problem is I have no clue what was (is) the stock coil, ignition etc.

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O'Reilly's Auto Parts, AutoZone are a couple of American chain parts stores...
Go on their websit...
Punch in 1973 Duster with a 318 engine on their website and look up the stock replacement components...