One thing to consider is how much power the engine is generating at any given time. If you're just cruising, then the stroker isn't generating any more power than the stocker. In that case, the stock system is adequate. And the stock system will tolerate occasional full power runs.

It's when you're using more power more often that an upgrade is needed. Think trucks with a towing package. They're expected to run at full power more often and need the better cooling package.

Personally, I'd run what you have and see how it goes. If you run into a problem, work on airflow first.