if its running a little hot, theres two things i'd look at, the size radiator in your mustang... the factory v-8 radiator really wont handle a performance engine too well, they just barely worked on the factory motors.... but i'd try messing with ignition timing first... also adding a shroud if you dont have one will help a bit... also if you're running the factory 4 blade mustang fan, scrap that immeadiately and get something a little more geared towards cooling the engine not just spinning around