Agree with what Danny P has said, I had the same issue and a dirty idle jet was my main issue. Took them out and changed them.
Another area you may want to check is the bolts from the webber carbs to the intake runners. One side of mine has come a little loos allowing air in and I would get a few pops on acceleration and also deceleration.
Last thing I did for mine was change the linkage to the dual carbs to a CPI unit, was pretty $$ but the car stays in sync more with the Heim Joints then the post in post cup of the CB units. Not your issue but will help keep the car in tune after. Really worked great!