Don't know, not the expert. You sure the park pawl is properly in place? You might get some answers by googling up some VB dealers and see what years etc fit
I guess I should compare the 68 comb which is in the middle one in the pic and the 70 comb which is on the right and see if the detent is the same distance from the front of the stop. The picture is a little deceiving because the one on the right is tilted and yes the park pawl is properly in place the comb stop just hits before it pulls the park rod out as far as it needs to be. I might have to do some clearancing on the comb stop Im thinking.