there is a minimum amount of time (pulsewidth) that it takes an injector to open/close. If an injector is too large it can cause idle issues as you lose the resolution when you try to get the pulsewidth numbers too small to get the proper a/f. In other words, you can only get the pulsewidth so low.
With that said, I've run bigger injectors than that without issue at idle or anywhere else. Although they were forced induction setups, idle is the problem a large injector usually has the most problem with, and a naturally aspirated or forced induction setup are basically the same there and mine had zero issues. Make sure you boost reference the regulator, it will help at idle by dropping the fuel pressure a bit with the vacuum line installed. My last setup was 75# injectors on a small block with a stock camshaft, idling at 650 rpm and 18" of vacuum. Ran perfect.
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