A friend of mines purchased a 2003 Mach 1 motor for his 98GT. He wants to put LT headers on the motor before the install and wants to know if the 99+ Cobra LT headers will fit around the tranny. Also the motor is off an Auto Mach1 with the cast crank, what should he set the rev limiter too. I know the Manual mach's have a 6800 red line and the auto has 6000 redline.