You have a bad injector or o-ring (I don't touch those disasters, dunno if they're top or sidefeed, if they're topfeed it can't be an o-ring, if they're sidefeed like a KA you could easily have a bad o-ring, and those are sometimes hard to seat without rolling them, make sure to grease it liberally when you go in with the new one), or fuel pressure regulator leaking down the vacuum hose, or something of that nature.
Go where the biggest puddle and clean marks are.
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