Forged steel is the strongest and cast steel crank will do the job up to around 600 HP.
If you're going to keep the motor N/A, a cast crank should be plenty. I went with a 4340 forged steel crank on my 331 because I will be adding a supercharger and wanted peace of mind.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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