What would a reasonable safe boosted HP limitation be for a stock 360 cast crank ?

Do Magnum cranks have any hp limitation differences over traditional 360 LA cranks?

Curious about using a cast crank in a small single turbo street/strip application.
360 buildup would be very similar to the mild combo that topfueldart has with his turbo 318.
topfueldart combo

PT6776SP, .96 AR turbo or something similar.

I am not looking for ridiculous horsepower but would anticipate that it would be seeing 10-15 psi of boost and in the neighborhood of 500-550+ hp

Fairly realistic numbers given 4500 ft elevation and tuning.

Plausible or ticking time-bomb?

I know the most sensible thing to do is go forged...just curious about the el cheapo first option.
topfueldart's 318