There are some crappy china cranks out there, so buyer beware...
A forged crank assembly should be stronger then what you have listed.

If your talking a 302 Block, blocks have been known to split in half over 500 HP. The 351W is a lot stronger. Good for over 700 HP.

If you have a 302 and plan on making that 550 HP, you should purchase an aftermarket 302 block.

Desk Top simulators are great for trying different things to see what the effects are, but are not real good for figuring what power you will be making.

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What is life worth, if everything comes easy...?
66 Stang 385+ HP 306 .494 /.520 225 durr @.05, 200cc Windsor Sr's, Edle RPM, C4, 3.00 posi, 575 Annular Mighty Demon, 22 MPG,