IN these days of so many choices the old factory stuff that Drag Racing built it's roots is very much over looked and under rated.
Problem is by now many of the original 5010 (I think) alloy factory GM steel cranks have gotten tiny spider cracks usually showing in the radius of the fillet. If you have one that is clean and can pass a WetMag inspection you have a good strong crank. A factory GM Steel 350 cu in High Performance crank in perfect shape can handle above 900 hp in a N/A engine, more in a turbo or blown engine. DEtonation will kill anything so I mean in good tune. A 454 LS-6 or LS-7 Factory GM Steel Crank can handle as much as 1,400 horsepower without detonation. A good factory 454 prepped 4 bolt main block or splayed cap block can also handle upwards of 1,400 horsies.
The key is get it fully inspected not cheaply inspected. Wet Mag costs a lot more for equipment but will show defects better. You can have defects that a regular dry magnaflux can not pick up.
Ed