Cast Crank Strength

If you go faster than 11.49 you will need a roll bar and when you get to 10.99 then comes the aftermarket axles, well at least at a NHRA track.
I would be more worried about the KB pistons than the cast crank with a 200hp+ nitrous. A hyperuetectic piston is still a cast piston, just a stronger version.
That .90 of a second will probably end up costing you just in safety equipment alone $750. For what just so you can say your car runs 10's? There is no shame in running 11.85 and is still a very fast street car. My drag car runs low 11's and for awhile was trying to get it into the 10's and decided to leave it were it is because of the added expense of the axles alone. It is very consistent and that is the ultimate name of the game in racing. If you want bragging rights just exaggerate a little, everyone else does.