Well, logically speaking - compare the performance of the VII to the performance of the IX. I think that gives us a rough idea of the impact it would have.
Even the IX was technically not well-suited to combat against convoys in the North Atlantic; if you notice, it was consistently used in lower-threat and far-away areas, aimed mostly at single shipping. I'm sure the American subs also excelled at that. This is also the reason that, as individual boats and in terms of tonnage, Type IX's were far and above more successful than the Type VII's.
The situation of the Italian boats is pretty comparable I think. They're probably much closer to American than German boats in most respects - and they did miserably against convoys and excellently on their own in far away areas.
But out in the North Atlantic against these kinds of escort froces, I don't doubt the American boats would not be successful, at least once said escort forces got a handle on the tactics. The convoy system would tear them to shreds - as it did the U-boats, which were technically better-suited. :hmm:
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