I have run a scat cast crank at a hp level of 425 at the rear wheel for over 700 passes and 55,000 hard street miles before pulling it apart to change pistons. Car weighed 3600 lbs, No slicks or t brake. Was checked for straightness and was spot on. Eagle cast cranks had issues. That being said $869 forged or $381 for cast tough call. I haven’t heard of a scat cast crank breaking. But going back and reading your intended use I would go forged.