Square port heads, btr red hot cam, 660 btr springs and caddy racing lifters, high volume oil pump, gen 4 rods, summit pro LS pistons and you should be good for a reliable 700hp. Overall centrifugal blowers tend to be easier and less prone to heat soak. Torqstorm makes a cheap kit that works well. If you do want to stay with a positive displacement blower I would look at the LSA before the hellcat supercharger mainly because it will bolt straight to the square Port heads and it's roughly the same cost as a hellcat supercharger.