What is the best LSD for Autocross? I have a Power lok out of my 68 that I can rebuild and how well will that work? Does anybody know the ratio on a power lok vs what else is out there?

07 Porsche C2 997.1 6spd DD and SCCA Solo II SS
68 Plymouth GTX Convert. 493cu Hotkiss Wilwood Classic air, Building for Solo II Cam
65 Chrysler 300 Convert. project
57 Desoto 2dr. Firesweep 392 Hemi,Wilwood Project with son
2003 Dodge Dakota R/T "DEAD"