340 turns over, got spark, won’t fire and run

Ooops... that is bad juju.... siphon some of it out and if it looks like reeeealy yellow dog pee, then you ought to get it all out. It'll smell skunky too. And if it has the typical ethanol in the fuel, then that will absorb water, turn into a gummy substance, and clog you carb big time.

Modern FI engines can often fire on old gas when older carbed engines with weaker spark systems cannot, so your older Dart is gonna need a regular diet of fresh clean fuel. And try to use non-ethanol gas when you get ready let it set for a while, or at least use a fuel stabilizer additive.

121gigawatts said

My old man is helping me. he made a gap from the plug to a screw driver grounded on the engine block. I turned the key and he said we had spark. We haven’t set the points gap.

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OK, it ought to be able to jump at least 1/4" with a blue spark in open air. If the gap set up for test in open air is really small, then that does not make a good test. It takes only a few thousand volt spark to jump a small gap in open air but that low voltage spark won't have a prayer of jumping the spark plug gap in a compressed fuel-air mixture. (Normal spark voltage from this type of system exceeds 20,000 volts.)