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Actually that depends on the upgrades. I would actually get a stock engine before I would get one with upgrades. Several factors go into that though.
Some upgrades aren't needed(contrary to popular opinion). The best thing that you can have in your favor for determining if any engine is good or bad is knowledge. Knowledge about the engine. How much knowledge should you have to have is debatable and depends on how much of a "gearhead" you are. But upgrades in of itself isn't going to help you if you don't know squat about the engine. Those upgrades might actually be worthless, but "you" wouldn't know it if you didn't know the engine.