I changed my 67 rs years ago.
I first used my old muncie shifter.
The linkage can be reworked to fit, if the muncie has the same size slot where the shift arms fit. There are two sizes short early, and longer slot late, around 68 was the change, and some had studs some had bolts holding the arm to the trans.
The muncie shifter is crap anyway. Mine jammed several times due to grit getting inside the reverse spring plunger inside the shifter. I had to dissasemble the shifter to make it work again.
I put a Hurst competition plus shifter on it later and it works great.
I got the model that is for a console equipped Camaro and it fits the hole in the floor fine. You might want to get that one even if you don't have a console.
Very late Muncies had a bigger output shaft with 32 splines and a fine spline input shaft. You would have to change your clutch disc and trans yoke if you have one of those.
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Can Am Vintage Racer
[This message has been edited by davidpozzi (edited 12-15-2000).]