The pistons are much more likely to go in these motors in my experience. Many motors have put down 800-1200hp with stock rods. In most cases it seems like pistons crack, but rods don't give out. Later model gen III motors had stronger rods as well. In some cases the rods will bend. I would still say the pistons are more important than the rods. If you are going to do a rebuild I would suggest swapping to forged pistons and rods and going over 30 to make it a 370.

6.0s can eat a lot of cam before a stall is needed. 228/230 will be drive able will not lacking up top. It will drive okay without a stall and react incredibly with a stall. If you think a stall is more than a year away then stick with a 220/224 cam.