In 1987, the 351 was the only engine to come with a carb. If memory servers me right, this was the last year for that. I've got an 87 with the 351 (and the factory carb), so I've attached a picture of the vacuum diagram. It's not a perfect picture, but it should help. I'm not sure if they changed throughout the year or not, but it should still be pretty close to what you are looking for. And I agree, I hate the plastic vacuum lines too. Seems like each time I do some work on the engine, I find another one that is so brittle that it breaks when you move it. I've been able to get replacement lines and connectors at most of the local auto parts stores.
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