[Anthony]

The reverse shifter rod is the one closest to the midline of the car. Follow that rod back, and that's the reverse arm on the tranny.

What I would do is to put the car in reverse, then disconnect the rod from the tranny, and see if the arm on the tranny will move any more backwards (with pliers or vise-grip), to further engage reverse. If it does, then you're not getting enough of a throw, and you either have to adjust the rod (make it longer), or get a shorter arm on the tranny, to get more of a throw.

I guess you have the throw rods and shifter arms correctly positioned on the shifter/tranny? From what I remember, the shifter arms come in two sizes, two that are the same, and a different length one ( I think shorter) that goes to the reverse shift fork mechanism.