I bought a 68 4 speed RR .. pretty original except the PO had stuck a pistol grip in it. Mine did not hit the dash but came up pretty close but it did in the 70 also. It still looked cool, but I pulled it and swapped the p grip into my 70 RR and put the round rod hurst style you have in the 68 (which is probably a 69 or 70 shifter as most 68's had the Inland brand shifter in them. The 70 had the 68/9 style shift in it when I bought it.
The stock p grips in 70 are slide in and will slide right into that stock appearing hurst shift mech you have.
Really the dash and shifter location are basically the same in a 68 and 70 RR. The floor pans are the same too for a 4 speed replacement floor pan.
Check this vid out and do some more google searching .. ff to 1:40 for an idea of what it would look like
http://www.youtube.com/watch?v=tnfG3ilQ41E
Whoops I just remembered you have a 69. You are all set. Get the pistol grip and enjoy