my buddies buildin a 74 dart sport with a 440,his is definatly gonna run better,but i'm always messin with him,we ARE definatly gonna run em at the strip a little,i just want to get the most outa what i got,no since in not racing,that's what it's all about oh and it's a 1/8th mile track so i should be able to maybe get away with a little more gear if recommended i said 3.91's but maybe 4.10's???