Anybody ever swapped out a heavy( stock) rotating assy for lighter aftermarket?

So my 13-1 OE rod KB piston 360 combo is dancing with the devil?? I’ve actually been pretty impressed with the stock mopar rods.... maybe I’m easily impressed. We did quit buzzing it to 7k rpm after the Racepak told on us. Funny how see shift light, make shift, eats up time.....