From everything I'm told about getting more rpm out of an engine I always hear not to increase the stroke because the longer the stroke the faster the relative piston speed which is harder on parts. Is this not true?
It all depends on the parts and combo. The rod ratio is still very good, and I've run my 360 up to 8000 more than once with no ill effects and I was running stock rods!
So lighter components, good oiling and good oil control will get you reliable rpm regardless of stroke.
Like I said, you can keep the current crank but it will be a weaker combo than the 3.58 stroke.
Indy heads have the valve centers moved towards the ex. side of the chamber so this will reduce shrouding.