How much HP can magnum rods take happily

That's a very good idea. It was suggested to me that I use Chevy pistons and just resize my top rod.
I'll see if I can find an off the shelf Chevy piston with a dish of 20 cc.
I'm not sure what material I need to suit my horsepower
Whats Chevy big end width as opposed to Mopar big end width? Get 6.0 rods and a taller piston.