I second the gates timing belt.. I have it on my fully built single cam. But really, u only need them if uve upgraded ur valve train, like ur springs and retainers.. I had the oem belt on my turboed build for about 3 months and when i decided to take the motor apart, i noticed that the belt was stretched out due to the stiff spring i have.. Besides the gates timing belt is just a cheaper equivalent to greddys $200 timing belt..
Oh! And my valve train is fully ferrea with titanium springs if ur wondering