408 Scat Stroker Kits

That is the magic statement right there..........what are you looking to do?? The often said statement of " for a few dollars more bla, bla, bla, you can buy peace of mind...." to me, peace of mind is knowing...."to know" implies certainty. My thoughts........less than 550hp and operational ceiling of 6500 rpm you'll be fine.
That's a good point. If you're aiming for 450ish HP it might make sense to just go with the cast. Personally, anywhere above that I'd do forged for peace of mind and to have room to grow. But again that's just my opinion and feelings on the thing. In the end it's a just a judgement call for you to make.