Coolant Help

Whats up guys and gals? I recently caught mopar fever when I picked up my first Dart Swinger 225 /6. With recent temps here in the high 90's to low 100's, the temp gauge creeps closer to where I don't want it to be...so being a rookie, here's my first question: whats the best coolant to use for a 225/6? good, bad, or ugly...I wanna hear it!

Thanks!!