If it shifts in Drive the TF-3 kit isn't active, on second look that plate might be the one included in the TF-3 kit to return the VB to fully automatic. In either case the plate needs to be installed if there are holes drilled in the VB transfer plate.

In the full manual mode the TF-3 kit allows the TP linkage to be used or blocked wide open, if the transmission shifts in Drive the TP linkage needs to be hooked up.