Which coolant and mixture is best?

Hi guys. So I have a 318 from a 77 charger and since I'm new to mopar I'm not sure what coolant will be best. I am running aluminum parts so I figured using dexcool was best. I'm running a little hot so I'm
gonna change out the water pump for more flow. Any recommendations on which coolant to use and what water to coolant ratio? I'll also be using a water wetter. Thanks!

Oh I live in Vegas so not worried about freezing...just need it to run normal in 100+ heat. Thanks!