The Trans-Go TF-2 kit will let you manually shift at whatever rpm you choose.
If you want it to shift at 6k rpm on its own (while in Drive) get the lighter weight governor kit from A&A.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
