Stacking would be fine. It won't be as efficient as running in series but they would be fine for your setup.
If you want MASSIVE airflow, that's the way to do it. If that's what you're looking for, replace the top 230 as well. Personally, I don't see the need. Replace the rear 140 with a better one and call it good. They have roughly 250-300CFM worth of fans on there in stock form. What are your temps now?
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