swapping 5speed to Auto for race purposes only

I run a 998 out of a 84 Diplomat. Lockup tranny with TCC circuit plugged, TA S800 ST 10" 3200, drive 50 miles to the track. Trans has low gear set and I've run 3.91 and current 4.10 gear. 60' 1.65 @2k launch average. 340/400hp