2bbl conversion -- worth it?

Hi! I've been on FABO for a long time, but I'm new to slant sixes. So, this 67 Barracuda convertible came with a few boxes of parts, including a Carter BBD and the 2bbl manifolds, newly painted, and the air cleaner base. It seems clear that my father was contemplating swapping out the Holley 1920 at one time. What I want to know is, what are the pros and cons? Any other parts needed? As far as I know the rest of the motor is stock, other than a Pertronix distributor.