A833 390 stroker what do I need to hold 400+ hp

Kendog 170 said

I've put the 833 guts in the Alumium OD trans before. You then have a Big front bearing and a lighter trans.

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will it be strong? If so can I buy the gears/shafts etc to make the upgrade? Or should I be looking for a regular a833 as a parts donor for all I need?