Cast iron is much stiffer than aluminum and resists deflection better. With drag racing the case deflection is tougher on gear contact patterns and cast iron may be the longer gear life approach. Road racing isn't usually quite as brtutal on the cases and gears seem to live longer with an aluminum case.
If you have mega torque and huge ultra sticky tires the choice is pretty obvious.
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1970 Mach I 380 Dry Sump + lots of mods
1990 C4 Corvette 400 in solid roller
1965 Corvette - back to life some day
1970 1/2 Z28 project car
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