carb suggestions

Hello everyone, I just finished swapping a set of 302 heads and a 268 comp cam on to my stock 318. I am running 340 drivers and 98 jeep pass side exhaust, edelbrock performer manifold and a 6oo holley vac secondary carb. My question is has anyone had to tune the carb after a swap like this? Is it worth the time on this carb or should i swap to another carb. I have not really driven the car yet, only broke the cam in, but the motor seems to have a flat spot when i give it gas (in and out of the driveway). Thanks in advance for the help