Good description of the situation.
O/P, you asked a most "generic" question. Please be more specific in the future to avoid all this. As you probably have surmised, such an open question is not valid. Some of us do this stuff for a living. We give our time here to "better" the hobby. We ask nothing in return. A little help would help us help you better.
Chevy made a 370 HP 350... A stock forged bottom end can easily withstand 600-plus HP.