No fly 403
Sudden loss of power plus decent spark does imply fuel blockage. Old ally tanks do give off cheesy crud which can block jets and fuel lines. Petrol pumps will struggle to suck enough fuel past the blockage. Maybe that's why you have both sorts of pump? Blow the fuel line clear backwards with an airline. New ethanol fuel is said to make rubber pipes swell up inside. ( eg flexi hose to fuel pump - should we be changing these?) And double check electrics; points, coil, plug leads , and inside the distributor anyway. Good luck- such a lovely car.
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