I have not done a whole lot of A engine work .. but I have done this "deal" a couple of times.

What causes this is a mal-adjusted choke ...and that is just pure carbon. This situation ONLY happens on the iron 2 bbl intakes ...from what I have seen and heard.

If this is a streeter application and you care about fuel-econ ....you do NOT want to leave the head plugged-up.

As was suggested above .... use a shop vac. But this is a two-man-job ... one holding the shop vac as close to the crossover as possible while the other guy uses a slow die-grinder(or a fast drill) ...with a carbide burr on it.

Using a OEM choke should not be a prob with an alum intake since the choke will pull-off quicker since the intake heats-up LOTS quicker.

Cleaning-out those stock 2 bbl intakes ? ... I have heard that those require sometimes a full-WEEK in a hot-tank !