11 sec. build cost?

I had a hurst floor shifter when I got the motor put in. I was 18 at the time and didnt have a garage big enough to do the swap so I took it to my dads friend who is a chevy guy. I also gave him the hurst shifter and he said it couldn't be done with the 722 which I have come to understand as being false. I love the feel of driving a reverse valve body car on the street and have no objections to spending 150 bucks on a shifter. How difficult is it to add the reverse valve body and add the stick shift. Am I going to have to drop the trans to do this?