Mopar 4.5" Crank

Thanks for the replies guys. I'm trying to decide which way to go with this motor so I have a few more questions. At what hp level is it recommended to step up the rotating assembly to better parts such as Callie's, Crower, Oliver etc? And how much power can K1 crank and rods handle in N/A. This will be in an aftermarket block on pump gas.