360 Engine Misfiring

When you say it only does it when you first start driving, do you mean when you first start the car and it is cold? Like you crank it up in the morning, leave the house, stop at a stop sign, then it pops as you give it gas to go again? Then once the motor warms up a bit it doesn't do it anymore? If so that's an issue with the engine not being warm enough to vaporize the fuel and you're getting a lean pop when giving it too much throttle input too quickly.