off the shelf rods/pistons for 470 B stroker for best rod ratio

To get a large rod ratio, you need a long rod. You cant have both a long rod, and a tall piston in a short deck (383/400) block. If i were you, i would put together what works, and not worry for ten seconds about rod ratio. 400 small block chevys, and 454s, have horrible rod ratios, and have gone billions of miles.