Torque converter or different cam

So the shop that was just working on our '64 Barracuda w/ a 318 in it, said that the cam appears to be pretty large for the motor. I like the way that the car sounds and runs, but it does lurch pretty bad when going into gear and when stopped at lights. They said that I could put in a torque converter to help the issues or put in a smaller cam.

Looking for some suggestions on which is the better route to go? Thanks in advance!