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A warmed up engine firing/starting after a few seconds cranking is tolerable. But, your 390 can do better. When everything is right, you should be able to reach in the (open) window, turn the key, and it should fire up immediately. Now that's the Holy Grail. If you have driven 500 miles and used a local engine & carb rebuilder, I would re-visit them . Throw the challenge to them to dig in their bag of training, and experience to get it to fire immediately. They would be glad to do it.If rebuilders are not local, find a local mechanic with GREY hair still running his own 1-2 man shop. He's a gold mine of experience , especially, if he is a Ford man and/or former race car driver. With immediate starts ( of warmed-up engine ) you know the engine is running at peak efficiency and peak gas mileage and so does everyone else . You're at the fun part now !
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