Listen to 68HEMI GTS, I went down the same road with a Liberty face plated 833, broke it on the seventh pass with a 500 horse small block. Spent a lot of money to end up where I should of gone in the first place, A Jerico DR4 with a soft-loc clutch. 68 HEMI GTS you have to get a DR4, you will never think auto again. These things shift so smooth when the clutch is right, it like shifting a full manual auto trans only with a clutch.
